OBD-II diagnostic connector

OBD-II provides access to data from the engine control unit (ECU) and offers a valuable source of information when troubleshooting problems inside a vehicle.

Vehicle telematics

OBD II is no longer only used by professionals and hobbyists to repair vehicles. OBD II information is commonly used by vehicle telematics devices that perform fleet tracking, monitor fuel efficiency, prevent unsafe driving, as well as for remote diagnostics and by Pay-As-You-Drive insurance. Although originally not intended for the above purposes, commonly supported OBD II data such as Vehicle Speed, RPM, and Fuel Level allow GPS based fleet tracking devices to monitor vehicle idling times, speeding, and over-revving.

Where to buy the OBD-IIOBD-II
There are many places to buy an OBD-II bluetooth such:

 

ELM327 OBD2 OBDII V1.4 Bluetooth Diagnostic Interface 

ELM327 Bluetooth Adapter Scanner Torque Android OBD2 OBDII Code Reader Scan Tool