Modelling Tourists’ Acceptance of Hotel Experience-Enhancement Smart Technologies

: Whereas the use of speciﬁc smart technologies in various sectors of the tourism industry has been under greater scrutiny in recent years, research that investigates tourists’ acceptance of smart technologies applied as a whole to hotels is largely underexplored. To address this shortfall, a study with a focus on tourists’ acceptance of experience-enhancement smart technologies has been conducted. A technology acceptance model based conceptual framework was developed, followed by a series of interviews with the managerial staff of ten hotels in Hong Kong that adopt experience-enhancement smart technologies. Based on the interview ﬁndings, a questionnaire was designed for use in a survey in which data were collected face-to-face from 312 tourists. Structural equation modelling was utilised to reveal the interrelationships between nine technology acceptance parameters. This study contributes knowledge to both real-world practice and research in tourism management.


Introduction
Information technologies have transformed the built form, infrastructure, ecosystem services and human services. Smart technologies, referred to as both hardware and software technology instruments that support inter-connectivity, have been increasingly used to provide convenience to tourists in searching for information, increase the operation efficiency of the hospitality sector, and promote hotels and tourist destinations. The hospitality industry, with its core value reliant on services delivery and quality, has been significantly influenced by smart technologies.
Developed from a number of enabling technologies-including video analytic, robotics, internet of things (IoT), data analytics and cloud technology, artificial intelligence (AI) and machine learning [1]-smart technologies in the hospitality industry generally fall into two categories: operation related (e.g., property management system, revenue management technology) and experience-enhancement related (e.g., facial recognition technology, smart room electronic control, virtual reality experience) [2]. Recently, such smart technologies have been extended to cover the applications on enhancing tourists' travelling experience and personal sensations [3].
In fact, the emergence of hotel smart technologies applications that enhance guests' experience has triggered discussions on their usefulness, user-friendliness and security as well as users' intention to use the technologies. With these issues are closely related to user behaviours, studies on guests' acceptance of specific smart technologies in the hotel sector, such as hotel reservation website [4], self-service technologies [5,6] and hotel access control system [7], have grown. Yet, studies on hotel guests' acceptance of experienceenhancement smart technologies remain to be seen. Aimed at contributing knowledge to this niche area and since understanding users' intention to use smart technologies is crucial to the long-term development of hotels' business, a study, as reported below, was initiated. The study gave special emphasis on two research questions, namely: (1) what factors affect tourists' acceptance of experience-enhancement smart technologies, and (2) how do these factors affect the tourists' intention to use experience-enhancement smart technologies.
This paper is structured as follows: Section 2 is a literature review on the definitions of smart technologies, their applicability to the hospitality industry, and recent studies on smart technologies in hotels. Section 3 clarifies the scope of experience-enhancement smart technologies and identifies the research gap that this study aims to fill. Section 4 develops a theoretical framework for the study, including the representations of the conceptual constructs and the hypotheses that the following sections test. Section 5 reports the research methodology and the data collected. Section 6 explains the data analysis processes and presents the findings. After highlighting the theoretical and practical implications in Section 7, the conclusions are drawn in Section 8.

Smart Technologies: Definitions, and Functions for the Hospitality Industry
Smart technologies refer to a combination of functions provided by both hardware and software components to establish seamless connection within the social space, taking the form of smart devices and smart systems [8,9]. Smart technologies can also be understood on two dimensions: enabling technologies and applied technologies. Enabling technologies, including video analytics, robotics, IoT, data analytics and cloud technologies, AI and machine learning, form the foundation of applied technologies. One type of applied technology is facial recognition, which was developed based on video analytics. Robot concierges, robotic vacuums, in-room service robots, etc. are developed based on robotics technology and IoT. Luggage tags in storerooms, in-room lighting sensors, automatic minibar items checking, etc. are technological manifestations of IoT. A smart hotel room consists of IoT-connected devices used to provide a seamless guest experience [7]. The emergence of IoT has extended the social space from its physical dimension to a virtual dimension [10].
In a general sense, Worden et al. [11] described smart technologies by emphasising the versatility of technologies that are adaptable to specific circumstances. Leonidis et al. [12] described "smartness" in the hospitality context as an efficient business ecosystem empowered by technologies. Zoughbi and Al-Nasrawi [13] described smart technologies in three "smart aspects": (1) automatic functions that provide customer driven service, (2) information collection, and (3) automatic learning that improves operating performance. Li et al. [14] defined smart technologies as the mechanism to facilitate positive consumer experience as well as collect customer information and use it to improve service performance.
As smart technologies are being integrated in a variety of social and business spheres, the meaning of smart technologies varies with the context in which it is applied. Widely applied to people's livelihood, environmental protection, public security, city services and other dimensions [15], smart technologies have been profoundly embraced in the hospitality industry, especially the tourism and hotel sectors [2]. The embeddedness of "smartness" in the hospitality industry originates from the adoption of new technologies to enable the operation systems to function in an interoperable and interconnected manner [12,16].
Smart technologies not only improve management capacity and operational efficiency of specific hospitality sectors, but they also enhance service quality and user satisfaction [7,[17][18][19][20][21][22][23]. Operation costs are significantly reduced by integrating smart features in operation processes [19,24,25]. With the proliferation of information and communication technology (ICT) and its wide use in the marketing domain, "smartness" or IoT is embedded in creating consumer experience and disseminating marketing information [22,[26][27][28].

Studies on Smart Technologies in the Hotel Sector
Research on smart technologies in the hotel sector includes behavioural studies. This group of studies enhances our understanding of business stakeholders' attitudes towards smart hotel technologies [29], hotel owners' perspectives towards adopting smart technology [30], employees' intention to adopt information technologies [31][32][33][34], and hotel guests' or travellers' attitudes, perceptions towards and experiences with smart hotel technologies [5,7,[35][36][37]. In particular, Murphy and Rottet [35] proposed and examined factors that affect hotel guests' willingness to adopt biometric devices. Kim et al. [5] investigated the concept of customer readiness and its effects on likelihood of using self-service technologies in a hospitality setting. In this same area, Shin and Perdue [38] conducted bibliometric analysis on the adoption of self-service technology in the hospitality industry.
Various models have been introduced or used in research relevant to the current study. Lam et al. [31] investigated the relationship between attitude, self-efficacy, and subjective norm and behavioural intention towards hotel employees' perceptions of information technology adoption. Based on the data collected from hotels in Hangzhou, China, they show that attitude, self-efficacy and subjective norms are positively related to behavioural intention; perceived IT beliefs had influence on the intention through attitude formation and task-technology fit appears to interact with perceived IT beliefs towards attitude formation. Sarmah et al. [36] developed an extended technology-based service adoption model to investigate hotel guests' innovativeness, willingness to co-create, demand for interaction and involvement on their intention to collectively develop new services using smartphone apps. Their findings reveal that both guests' innovativeness and need for interaction with service staff significantly affect their involvement. A guest's willingness to co-create acts as a partial mediator between his/her innovativeness and intention to adopt co-creatively developed new services. Focusing on a hotel access control system, Lim et al. [7] applied the technology acceptance model to examine hotel guests' acceptance of the system for seamless hotel check-in and room access. The results of their study show that the ease of using and usefulness of the system significantly facilitated seamless experiences in hotel check-in and room access, which in turn, significantly shaped attitudes towards using the system. By collecting hotel customers' opinions at a smart hotel, Wu and Cheng [37] used a conceptual model to synthsise the dimensions of technology attachment, dimensions of experiential relationship quality, experiential risk and experiential sharing intention. In their study, technology identity, technology affection and technology social bonding were proved to play important roles in increasing customers' confidence in the smart technology provided by the smart hotel; technology dependence, technology identity and technology affection plays critical roles in influencing perceptions of experiential satisfaction; further, experiential satisfaction has a positive influence on experiential trust, and experiential trust and experiential satisfaction positively influence experiential sharing intentions. Sun et al. [34] investigated the impacts of individual-level cultural values (e.g., collectivism, power distance, long-term orientation, uncertainty avoidance, and masculinity) on the technology acceptance model (e.g., perceived usefulness, perceived ease of use) with the data collected from employees in the hotel industry in the U.S. context. Ten hypotheses were developed to test he relationships between the five individual-level cultural values and the TAM model. The results show that eight hypotheses were supported and the proposed seven-factor model is valid and reliable. In examining hospitality platforms that are supported by smart technologies, Buhalis and Leung [2] propose a 'smart hospitality ecosystem' which can add value to its stakeholders.
The above studies show that smart technologies applied in hotels are important elements affecting tourists' experience, hotel operation and the landscape of hotel business in the long term. However, so far, no studies have comprehensively investigated the major smart technologies that are involved in tourists' experience enhancement, which represents the core value of the hotel sector-providing services that create memorable experiences for their guests. As such, it is necessary to study experience-enhancement smart technologies applied in the hotel sector, including the perception of hotel users of such technologies.

Experience-Enhancement (EE) Smart Technologies
Users of smart technologies in the hotel sector fall into three categories: operators, tourists and linked external parties [2]. This study focuses on the smart technologies that are accessible to tourists who stay at hotels as patrons, viz. "experience-enhancement (EE) smart technologies". This notion of technology is directly associated with tourists' hotel stay experience and their satisfaction in hotel services such as smart check-in/out (e.g., using smartphone apps or check-in kiosk, IoT facilitated electronic bill for check-out), smart concierge (e.g., beacons enabled with location identification and digital guidance inside hotel areas, restaurant/entertainment activity recommendations or bookings through smartphone apps, virtual reality experience), smart in-room services (e.g., e-key within the guests' personal devices, facial recognition or beacons, IoT supported mobile apps for in-room electronic control, voice-enabled virtual assistance, room services delivered by autonomous robot, e-housekeeping apps), etc. These smart technologies are embedded in the "guest touchpoints" which are referred to as points of contact for human-interactive service to enhance guests' experience, such as search, booking, greetings and check-in, stay, check-out. For example, at the greeting and check-in touchpoint, after the tourists enter the hotel lobby, smart cameras with facial-recognition capabilities recognise them from the passport photo submitted during mobile check-in prior to arrival. Some hotels develop mobile app with which tourists can conduct fast check-in on their own and a mobile key is then activated for the tourists to enter their room.
Aside from enhancing tourists' experience, another important business strategy behind the development of EE smart technologies is to collect service users' personal behavioural data in order to further develop and improve personalised services. Personalisation is an important approach to delivering services that meet customer expectations, that is, to provide customised services to match customers' needs and preferences [39]. Collecting users' behavioural information to form a comprehensive database for the analysis of customer choices is key to meeting customer expectations [40]. Customers' inherent preferences revealed in the service consumption process are essential for the service providers to achieve personalisation in their service design and planning [41]. In the near future, a variety of EE smart technologies will be provided to improve service delivery as well as facilitate the formation of "internal big data" to enhance personalised services [2]. Therefore, understanding the acceptance of EE smart technologies is pivotal to the strategic development of personalised services in the hotel sector.

Conceptual Framework Development
Many studies have adopted technology acceptance (TAM) extended models to explain tourists' acceptance of various hospitality and tourism technologies. For example, Lai [42] summarised the tourists' acceptance of smart technologies studies published from 2005 to 2012 and analysed the TAM extended models adopted in studies on tourism websites, online booking systems, travel e-shopping, hotel reservation websites, internet adoption, airlines, online travel communities, property management system in hotels and Facebook. Since 2012, more studies on smart technologies acceptance in hospitality settings from the tourists' perspective have been conducted, including radio-frequency identification (RFID) technology acceptance in the hospitality industry [43], smart technologies in airline ticket purchase [44,45], self-service kiosk at hotels [6], self-service technologies in hospitality settings [5], hotel tablet apps [46], social media networks [47] and hotel access control system [7].
In a hospitality setting, employees are often under pressure to take up new technologies for achieving organisational or career goals. But tourists, who are customers of the hospitality sector, are free to choose whether or not to use those technologies according to their own wishes. This implies that decisions of tourists on using smart technologies is attributed to their beliefs. Thus, TAM is suitable for investigating the smart technologies adoption behaviour from the tourists' perspective.

Technology Acceptance Model (TAM) and Its Three Approaches for Extension
TAM was initially developed to test employee intentions to adopt new technologies for efficiency services [48]. It has proven powerful to represent the antecedents of the intention to adopt new technologies [49,50]. TAM adapts its framework from the theory of reasoned action (TRA) for user acceptance of information systems. It assumes one's actual use of new technology is directly or indirectly influenced by one's behavioural intention, attitude, perceived usefulness of the technology and perceived use of the technology. One's behaviour is affected by one's behavioural intention and shaped by one's attitude [51]. Studies on technology acceptance commonly focus on the relationships among beliefs (perceived usefulness, perceived ease of use, etc.), attitude, behavioral intention and action.
Perceived usefulness (PU), perceived ease of use (PEU), attitude towards use (ATU) and intention to use (ITU) technology are the four theoretical components of TAM. PU refers to the technology users' belief that new technology improves the performance of a certain task [4] and PEU describes the extent of convenience and effortlessness of using new technology [52,53]. ATU is the emotion and judgement towards using technology; favourable attitude towards new technology results in strong ITU [54,55].
Although TAM has been criticised for its oversaturation, it is still considered as one of the most widely accepted models in studying consumer behaviour in the hospitality industry [33]. Over the past three decades, TAM has been used as a theoretical foundation to examine new technology acceptance in many social disciplines, with the support of empirical data. According to Wixom and Todd [56], there are three main approaches to developing extended TAM models: the first is by introducing variables from related models-subjective norms and perceived behavioural control in the theory of planned behaviour (TPB) are commonly integrated to form an extended TAM model for explaining their influence on behavioural intention; the second is by incorporating new belief factors to test their predictive powers on attitude towards new technologies; the third is by introducing external variables as antecedents to TAM on attitude through PU or PEU.
Assuming user behaviour may vary in different technology use contexts, additional constructs were proposed to form an extended TAM model and test their relationships in the context of hotels. Figure 1 illustrates the conceptual framework of this model (green dotted box); it incorporates the applicable variables of the three approaches summarised by Wixom and Todd [56]: TPB, behavioural belief factors and external variables affecting TAM, as in the blue, brown and purple dotted boxes, respectively. The next part further elaborates the hypotheses developed based on the conceptual framework. Whether tourists accept smart technologies in the hotel sector and so are willing to use them is of empirical value. Whether tourists have positive perceptions of or hold positive attitudes towards smart technologies is a key to predicting their intention to use. Attitude plays an influential role in tourists' intention of using smart technologies. A tourist has the option between smart technologies and traditional service. PU and PEU are the Whether tourists accept smart technologies in the hotel sector and so are willing to use them is of empirical value. Whether tourists have positive perceptions of or hold positive attitudes towards smart technologies is a key to predicting their intention to use. Attitude plays an influential role in tourists' intention of using smart technologies. A tourist has the option between smart technologies and traditional service. PU and PEU are the two variables that reflect the tourist's perception of outcome (effectiveness of service) and process (convenience and time-saving efficiency). According to the traditional TAM model (see green dotted box in Figure 1), it is hypothesised that PU and PEU influence ATU and that ATU is positively associated with ITU: Hypothesis 1. Tourists' ATU smart technologies positively affects their ITU.

Hypothesis 2.
Tourists' PU of smart technologies positively affects their ATU.

Hypothesis 3.
Tourists' PEU of smart technologies positively affects their ATU.

The Theory of Planned Behaviour (TPB) and Associated Factors
Extended from the theory of reasoned action (TRA) [57], TPB offers further theoretical insight into human intentions [58], which involves perceived behaviour control (PBC), subjective norms (SN) and attitude towards using (ATU). Traditional technology acceptance research often introduces factors of TPB to model behaviour of using technology [59][60][61][62]. This study incorporates the factors of TAM (see Figure 1), PBC, SN, as well as perceived security (PS) and compatibility (COM) that influence hotel guests' intention to use smart technologies.

Perceived Behavioural Control (PBC) and Subjective Norms (SN)
In the TPB model, PBC refers to an individual's perception of the possible difficulties when demonstrating a specific behaviour [58,63]. TPB hypothesises that the more an individual is able to have control over opportunities and resources to perform a specific behaviour, the more likely the behaviour will occur [63]. In the context of hotels, tourists' possession of certain resources or opportunities motivates them to use technologies, such as owning a smartphone with internet data connectivity. Without data connectivity, tourists are unable to use smart technologies provided by hotels. It is straightforward for the tourists to decide on their level of perceived behavioural control over smart technologies.
SN is "a person's perception that most people who are important to him think he should or should not perform the behaviour in question" [57]. Its role is perceived differently in TAM and TRA. In TRA, SN is believed to directly influence ITU, while TAM does not include SN to influence ITU. In TPB, SN is among the three factors that directly affect ITU [64]. This variable may play a significant role when one travels with his or her family members or good friends. The three theoretical components of TPB are merged in the TAM-based model (blue dotted box in Figure 1), in which SN is proposed as a factor directly and indirectly affecting ITU (affecting TAM as an external variable-shown in the purple dotted box).

Hypothesis 5.
Tourists' SN positively affects their ITU smart technologies.

Perceived Security (PS) and Compatibility (COM)
Using smart technologies usually incurs data privacy concerns. To use an app, registration usually requires one to provide his or her phone number, email, home address or credit card information. PS is considered as a key factor affecting technology acceptance, and it has been widely studied in industries concerning information security, such as online banking [65]. PS of hotel customers relates to their trust in the hotel organisation as well as the relevant information systems [66]. It is essential for hotel managers to understand whether PS is a barrier to the use of smart technologies. Tourists' data privacy concerns are: (1) whether their personal information will be stored properly; (2) whether their information will be manipulated for third party marketing; and (3) whether their information will be obtained by a third party without their consent, etc.
User attitude towards using smart technologies relates to how "they feel or think about an innovation" and whether the technologies meet their need in doing things [67,68]. Compatibility (COM) describes people's behaviour of using an innovation that is consistent with their "existing sociocultural values and beliefs, past and present experiences and needs of potential adopters" [69]. It has been identified as an essential factor for innovation adoption [69,70] and has proved to have significant effects on attitude and/or intentions [60,71]. Tourists' attitude towards using smart technologies is considered to be associated with their perception of innovation, as most smart technologies that hotels adopt such as facial recognition check-in, service robot delivery, and virtual reality (VR) technologies for room selection preview are highly innovative. Furthermore, past experience of using smart technologies also affect customer attitude. For example, if a customer is familiar with smart technologies for daily life activities, he or she would be more willing to use similar technologies for hotel services. In this study, PS and COM are proposed to be two behavioural belief factors along with PU and PEU affecting ITU through ATU.

Hypothesis 6.
Tourists' PS positively affects their ATU smart technologies.

Hypothesis 7.
Tourists' COM positively affects their ATU smart technologies.

External Variables: Subjective Norms (SN) and Self-Efficacy (SEL)
In some contexts, the original TAM may fail to capture certain human motives of technology acceptance [61]. Davis [52] proposed that some external factors affect ITU by exerting mediating effects on PU and PEU. Aside from directly influencing ITU, subjective SN is also proposed in this study as an external factor influencing TAM (purple dotted box in Figure 1 refers). In the context of using hotel smart technologies, SN is regarded as influencing user attitude towards smart technologies. One's attitude of using environmental friendly-products can be heavily affected by cognitive distance (or 'importance') [72,73]. For example, a person who regards the smart-check-in app as a preferred tool is likely to influence the attitude of another (e.g., friend or family member) to use the app, thus motivating the ITU of the latter. This is generally supported in the TPB literature.
Fundamentally, smart technologies can provide convenience and enhance users' experience of their stay. SN, a social influence factor, is regarded as related to one's attitude through PU. Venkatesh and Davis [74] proposed that SN has influence on both PU and ITU in the TAM model. It is thus reasonable to propose that a person's attitude towards a hotel smart technology can change if someone important to this person considers that the technology is useful for obtaining the relevant hotel service. For example, when the hotel check-in queue is long, a family member's suggestion to use a smart check-in function can be persuasive, affecting the attitude of the other family members towards the queuing. In other words, SN influences one's attitude through PU. SN is the antecedent of PEU to influence ATU. Besides social pressure factors, one's capability to use smart device may influence one's PU and PEU of smart technologies. SEL is used to describe one's capability to use a computer in technology acceptance studies [75]. Using smartphones or other devices to receive services can be a barrier to tourists. Some smart hotel technologies are not easy to comprehend. A concomitant hypothesis is that one's capability to use smart device, represented by SEL, positively influences PU and PEU (purple dotted box in Figure 1 refers).

Hypothesis 10.
Tourists' SEL positively affects their PU of smart technologies.

Hypothesis 11.
Tourists' SEL positively affects their PEU of smart technologies.

Research Methodology
Subsequent to the literature review above and conceptual model building processes, the study proceeded with two more stages: interviews and a survey. Both interviews and the survey were conducted from January to May 2019. As not all hotels are equipped with smart technologies, it is necessary to investigate whether smart technologies have been adopted by the target hotels and, if so, what sorts of technologies have been in use. For this purpose, interviews were held with the hotels' managerial staff to discuss the current application of experience-enhancement smart technologies in their hotels. The interview findings, particularly on the smart technologies adopted, formed the basis for designing a survey in the next stage.

Interviews
Interview invitations were issued via mass email to the 235 hotels that were listed on the Hong Kong Tourism Board PartnerNet [76]. Ten hotels, graded between 3-star and 5-star and located in eight different districts of Hong Kong, accepted the invitation. For each of these hotels, one to two managerial staff were interviewed face-to-face to identify the EE smart technologies that they have adopted and to discuss how the technologies were applied to enhance tourists' user experience. Each interview lasted approximately 45 min to one hour and only involved one interviewee. A total of 13 interviews were conducted. After explaining the definition and scope of experience-enhancement smart technologies, three questions were asked: (1) Can you briefly introduce the hotel where you work and your role/position at the hotel? (2) What types of smart technologies are adopted in your hotel? (3) How are they applied in the hotel operation process to enhance tourists' user experience? Table 1 summarises the profiles of the hotels and interviewees. During the interviews, the hotel managerial staff indicated the smart technologies adopted in the hotels where they worked, and explained the purpose of the smart technologies, their functions and operation process. The EE smart technologies were identified through the interviews and were summarised and then categorised based on five "guest service touchpoints": search, booking, greetings, check-in, stay (in-room and other service areas) and check-out. Figure 2 illustrates the identified hotel smart technologies and the touchpoints at which they are applied in the hotels in Hong Kong. adopted in the hotels where they worked, and explained the purpose of the smart technologies, their functions and operation process. The EE smart technologies were identified through the interviews and were summarised and then categorised based on five "guest service touchpoints": search, booking, greetings, check-in, stay (in-room and other service areas) and check-out. Figure 2 illustrates the identified hotel smart technologies and the touchpoints at which they are applied in the hotels in Hong Kong.

Survey
Based on the above interview findings, a questionnaire was designed for use in a survey. After running a pilot survey with 20 respondents, the questionnaire, comprising three parts, was finalised. Part 1 provided an introduction of the purpose of the study and the scope and definitions of the smart technologies in the context of this study. Part 2 sought to identify demographic attributes of the respondents, including gender, education level, age and place of origin. Part 3 contained twenty-eight questions that measure the nine constructs (PU, PEU, PS, COM, SN, SEL, PBC, ATU and ITU) shown in Appendix A (Table A1). The

Survey
Based on the above interview findings, a questionnaire was designed for use in a survey. After running a pilot survey with 20 respondents, the questionnaire, comprising three parts, was finalised. Part 1 provided an introduction of the purpose of the study and the scope and definitions of the smart technologies in the context of this study. Part 2 sought to identify demographic attributes of the respondents, including gender, education level, age and place of origin. Part 3 contained twenty-eight questions that measure the nine constructs (PU, PEU, PS, COM, SN, SEL, PBC, ATU and ITU) shown in Appendix A (Table A1). The judgement questions for this part adopt a seven-point scale, from 1 (strongly disagree) to 7 (strongly agree).
For this survey, the survey administrators were sent to 11 popular tourist spots in Hong Kong: Avenue of Stars, Hong Kong Museum of History, Hong Kong Museum of Art, the Peak, Lan Kwai Fong, Man Mo Temple, Tai Kwun, Star Ferry Terminal, Hong Kong Park, Golden Bauhinia Square and Times Square. These places were selected based on two grounds: first, they are among the recommended attractions of the Hong Kong Tourism Board [77]; second, they are located in three areas (Central and Western district, Wai Chai district and Yau Tsim Mong district) with high levels of hotel density [78]. 340 tourists who had hotel stay experience in Hong Kong were approached face-toface to participate in this survey. At the beginning of each survey interview, an introduction of smart technologies and examples of EE smart technologies commonly used in Hong Kong (e.g., e-guest apps for pre-arrival greeting, mobile apps for booking and self-check-in, facial recognition for self-check-in, e-payment for deposit payment, robotic concierge, touchscreen-based in-room controlling panel, service robot for delivery service, smart room key) were explained to the participant. This was to ensure that the participants had a consistent understanding of the EE smart technologies in the study.
Each of the survey interviews took around 20 min to complete. Among all the interviews, 28 interviewees did not answer all the questions in the questionnaire, resulting in a valid sample of 312. Table 2 shows the demographic information of the sample.

Analysis and Findings
Using STATA 15.1, the data obtained from the survey interviews were analysed by structural equation modelling (SEM) to test the relationships and interactions among the variables, including their direct and indirect effects [79]. Commonly used in customer behaviour analysis, SEM models simultaneous interactions among exogenous and endogenous variables [80] and it allows for breaking down the total effect of a variable into direct and indirect effects through path analysis [81].

Factors Loading and Cronbach's Alpha Reliability Test
We tested the reliability of the indicators through explanatory factor analysis and Cronbach's Alpha test. Table 3 presents the test results. All the factor loading values of the constructs are above 0.5, which satisfies the cut-off point [82]. All values of the Cronbach alpha test are above 0.8, showing high-level internal consistency. This shows that the conceptual construct has reasonable degree of reliability and internal consistency.

Correlation Analysis
We performed correlation analysis to evaluate the linear relationships of pair-wise constructs in each path of technology acceptance. Table 4, which summarises the zero-order correlation coefficients of the paired constructs, shows that ITU, PU, PEU, SN, ATU, COM, SEL and PS are significantly correlated with their pair-wise indicators. PBC significantly correlates with ATU but is insignificantly correlated with the other variables. Meanwhile, the correlation coefficients of some indicators are quite high, such as ITU with ATU, COM with ITU and SEL with PEU. For example, the correlation coefficient of ITU and ATU is 0.77, indicating that the relationship between these two indicators is strong and positive. At the same time, the standard deviation values of these variables are not high, indicating that the response has been fairly concentrated to the mean.

Model Fitness
We applied SEM to establish the model of technology acceptance behaviour [83]. Summarised in Table 5 are the results of Chi-square (χ 2 ) and five other indices: RMSEA, AIC, BIC, CFI and TLI. The χ 2 value assesses the magnitude of discrepancy between the sample and fitted co-variances matrices (Hu and Bentler, 1992). Compared to the threshold value (p = 0.05), the computed p value is far smaller and thus indicates a significant result leading to a good model fit. As for RMSEA (0.08: good fit; 0.08 to 0.10: mediocre fit) [84], the calculated RMSEA-being 0.08-indicates a fair fit as the RMSEA cut-off points have been reduced considerably in the last two decades [80]. Given a moderate sample size (312), we also examined the CFI value for making comparison between the sample covariance matrix and its null model. The computed CFI is 0.918, which is close to 1.0, indicating a good fit for the model. With TLI > 0.9 being the recommended threshold, the computed value (0.909) also indicates a good fit for the model. Overall, the test supports a good fit between the data and the proposed structural model.  Table 6 summarises the hypotheses test results, which were obtained through estimating the path coefficients to test the relationships between the dependent and independent variables. All the proposed structural variable coefficients are standardized, and statistically significant (p < 0.001), suggesting that all the covariates have a positive effect on intention to use. The structural variable coefficients reflect the direct, indirect and total effects of hotel technology acceptance.

Theoretical Implications
In this study, the definition and scope of hotel smart technologies are reinforced. This study highlights the business and service nature of smart technologies in the hotel sector and frames this group of technologies as EE smart technologies. In fact, the development of EE smart technologies was initiated by hotel owners and operators to improve service quality as well as to facilitate sales and marketing based on behavioural data of their customers. Such technologies were not developed for isolated functions, but were designed with an intention to integrate with each other as a package of service delivery. For example, "smart hotel room" is a system supported by the integration of various types of smart technologies used in the hotel room area. These technologies were designed to streamline the service delivery process from initial contact to post-consumption marketing. The future trend of EE technologies lies in their seamless integration to provide smooth service experience to tourists. Thus, it is necessary to understand the EE smart technologies instead of investigating only some of the smart technologies. Furthermore, this study leads to several theoretical contributions. First, the findings of this study confirm that a TAMbased conceptual framework provides an extensive comprehension of tourists' behaviour and intention of using smart technologies. Although TAM is widely used to study employees' and hotel guests' acceptance of specific types of technology in the hotel sector [29][30][31][32][33][34][35]38], the role of PS and COM in influencing tourists' attitude towards using hotel smart technologies were ignored in the literature. This study confirms that PS and COM as tourists' individual-level factors have influences on their acceptance of hotel smart technologies. As self-service technologies are commonly adopted in the hospitality setting [32,85], more emphases shall be placed on investigating the role of tourists' individual-

Theoretical Implications
In this study, the definition and scope of hotel smart technologies are reinforced. This study highlights the business and service nature of smart technologies in the hotel sector and frames this group of technologies as EE smart technologies. In fact, the development of EE smart technologies was initiated by hotel owners and operators to improve service quality as well as to facilitate sales and marketing based on behavioural data of their customers. Such technologies were not developed for isolated functions, but were designed with an intention to integrate with each other as a package of service delivery. For example, "smart hotel room" is a system supported by the integration of various types of smart technologies used in the hotel room area. These technologies were designed to streamline the service delivery process from initial contact to post-consumption marketing. The future trend of EE technologies lies in their seamless integration to provide smooth service experience to tourists. Thus, it is necessary to understand the EE smart technologies instead of investigating only some of the smart technologies. Furthermore, this study leads to several theoretical contributions. First, the findings of this study confirm that a TAM-based conceptual framework provides an extensive comprehension of tourists' behaviour and intention of using smart technologies. Although TAM is widely used to study employees' and hotel guests' acceptance of specific types of technology in the hotel sector [29][30][31][32][33][34][35]38], the role of PS and COM in influencing tourists' attitude towards using hotel smart technologies were ignored in the literature. This study confirms that PS and COM as tourists' individuallevel factors have influences on their acceptance of hotel smart technologies. As self-service technologies are commonly adopted in the hospitality setting [32,85], more emphases shall be placed on investigating the role of tourists' individual-level factors in affecting smart technologies acceptance [34]. This study also tested how SN and SEL affect the TAM model. The four hypotheses were supported, implying that some human motives of technology acceptance affect the TAM model [61]. Second, TAM provides a fundamental basis for consumer behavioural studies related to new technology acceptance, and its explaining power can be further strengthened when it incorporates additional variables to adapt to the contexts of new consumption styles and new technology applications. As using hotel smart technology can be seen as a consumption process that includes learning, self-reflecting and benchmarking behavioural activities, variables from TPB, PS, COM and SEL, which were proposed with reference to the actual situation of the hotel service receiving context, have been incorporated into the TAM-based conceptual framework [61]. Third, both TAM and TPB have manifested a high level of adaptability when they are used in combination with other theoretical constructs to explain complicated customer behaviour. Although the issue of TAM oversaturation is often criticised, the statistical findings of this study reveal that the extended TAM model is powerful in predicting the behaviour of intention to use. Last, the TAM-based conceptual framework is foreseen to be adjustable for use in future studies to investigate acceptance of smart technologies in contexts beyond the hotel and tourism environment.

Practical Implications
This study also results in important implications to smart technologies application in the hotel sector. First, PS and COM were found to have positive influences on attitude as antecedents of tourists' intention to use smart technologies. This implies that extra effort should be committed to guaranteeing tourists' data privacy, and this should be emphasised when hotels promote smart technologies that involve the inputting of personal information. Second, as smart technologies are usually used to enhance hotel brands and strengthen their positions of being innovative, over-emphasising the use of smart technologies may create a cognitive barrier to people who perceive themselves to be slow to adapt new technologies. Therefore, it is necessary to downplay the "innovative" aspect when applying smart technologies to services delivery. Third, this study provides empirical evidence for hotel practitioners to review hotels' adoption of smart technologies in enhancing guests' experience, especially when they need to make decisions on the application of smart technologies under resource-constrained circumstances. The use of smart technologies has become a prevailing trend in service industries, including the hotel industry. With the continued advancement of the technologies, the functions of hotel smart technologies will be further improved. Although users' behaviour will change over time, a clear understanding of the current hotel guest behavioural intention and the factors affecting the intention will facilitate the hotel sector to implement adjustments in management decision-making and marketing strategy formation.

Conclusions
Previous studies on hotel smart technology acceptance usually focus on a particular technology, such as reservation websites, self-service kiosks, etc. While they have provided useful information about the applications of these technologies to hospitality services delivery, tourists' acceptance of hotel smart technologies as a whole remains underexplored. Contributing knowledge to this niche area, this study has identified the commonly used EE smart technologies in hotels, distinguished experience-enhancement (EE) smart technologies from operating smart technologies, and established a TAM-based conceptual framework with enhanced explaining power to investigate tourists' behavioural intention of using smart technologies.
Based on the TAM-based conceptual framework and using the SEM technique, the study has successfully modelled the tourists' acceptance of smart technologies. The findings from the statistical analysis, which have revealed the interrelationships between the various model parameters, contribute to the understanding of the effects of those parameters on the tourists' acceptance of smart technologies.
This study has several limitations. First, the study was conducted in Hong Kong and thus some findings of this study are specific the city's context. Second, though the sample size is sufficient for statistical analysis, it may still be too limited for generalization. Future studies can be extended into other contexts with larger sample size to increase the validity and applicability of their findings. Further, the present study combines the TAM with TPB to develop its theoretical model. Future studies can combine TAM with other theories and models, such as innovative diffusion theory, for enhanced results and implications. Informed Consent Statement: Informed consent was obtained from all subjects involved in this study.

Data Availability Statement: Not applicable.
Acknowledgments: The authors would like to acknowledge Yi Xiao, a student at the School of Hotel and Tourism Management, CUHK, for her excellent research assistance and data collection administration. The authors would like to thank the anonymous reviewers for their constructive comments.

Conflicts of Interest:
The authors declare no conflict of interest.

SN2
Most people who are important to me want me to use smart technology to receive service from hotels.

SN3
People whose opinion I value would prefer that I use smart technology to receive service from hotels.
5. Attitude towards using smart technology ATU1 I think it would be very good to use smart technology to receive service from hotels.

ATU2
In my opinion it would be very desirable to use smart technology to receive service from hotels. ATU3 It would be much better for me to use smart technology to receive service from hotels.  Smart technology fits well the way I access and receive service from hotels. COM4 Using smart technology to receive service from hotels is compatible with the way I travel.

COM5
Using smart technology to receive service from hotels. fit my lifestyle.
8. Self-efficacy SEL1 I am proficient in using smart technology to receive service from hotels. SEL2 I feel confident that I can use smart technology to receive service from hotels.

Perceived security PS1
Using smart technology to receive service from hotels is safe. PS2 In general, using smart technology to receive service from hotel is secured.