-An OBD adapter (sometimes referred to as a “vehicle interface adapter”) is an electronic device that allows the head unit to access the vehicle network. It is similar in operation to a computer modem or a gateway, in that it translates messages from one protocol to another.
How to connect:
https://www.youtube.com/watch?v=TGL9iSdFMBo&t=47s
https://www.youtube.com/watch?v=gRM1AsWWo7g
The OBD adapter can be used with any Android device (e.g. Android phone or vertical head units) with the exception of horizontal head units due to Torque Lite app compatibility.