OBD2 Male Port to Cigarette Lighter Female Connector Cable Cable uses very thick 24awg wire with 3A Fuse,Needed constant 12v power without all the wiring hassles Cable Length: 9.8 ft (3meters) In this way, you can change your car battery, also by get the alternative 12V power source from another car, when you not have a jump starter on hand. 3 AMP fuse built into the memory saver, better reliable on overload protection This device can work with any 12V DC power source, including jump starter, DC 12V Lead-acid battery, or another cars DC 12V power outlet.