The zip file contains the following directories and file:
1. Device D1 source code - containing source codes for programming the main unit (Arduino Micro);
2. STLs for 3D printer - containing 3D models of the device housing (D1_device.FCStd for FreeCAD, D1_device.stp), files in stl format (Stereolitography) for 3D printer)
3. D1_circuit.png - containing the electronic circuit diagram of the device