The GPS901-4G from KJB is an iTrail Snap OBD-ll 4G Tracker. It is the easiest way to begin tracking a vehicle. Insert the iTrail Snap into your On Board Diagnostic Port (OBD-II) and you'll be tracking in minutes. Because you are using the OBD-II port you never have to worry about battery life. 4G GPS + our exclusive iTrail Live GPS Tracking Platforms.