* Support Multiple Systems: ----Engine, Transmission, Instrument Panel, Drivetrain, Braking System, Suspension, ABS, ESP, EPS, Fuel System and etc. You can get real time data related to system and do some repair by yourself using this truck tool, which will save much time and money. * Wide Converage: ----It is a 2 in 1 Trucks & Car Diagnositc Tools，which support all heavy duty trucks(J1587, J1939 and J1708) and all OBD2 standard protocols. Not only can work on Freightliner, Kenworth, Mack, International, Sterling, Paccar, Peterbilt, Caterpillar, Western Star, Mercedes-Benz, Man, Scania, VOLVO, Renault, Erf, Foden, Seddon-Atikinson, Daf, Sisu, Steyr, ISUZU, Hino and more diesel trucks; but also can support all cars, mini vans and light duty vehicles after 1996 * Battery Power Monitor + One Key Help: ----If the battery voltage is less than 11. 8v, it shows you start engine over to 1500rpm and charge the battery, if it is less than 10. 8v, show stop the testing and check the battery. As for "?" Button, please...