Recharge your battery jump with this handy male-to-male plug. Hooks into the DC power port of your battery jump starter and then the other end would plug into the DC power port or cigarette lighter of your car. Allows your car to charge your battery booster pack through the vehicle's alternator. So if you don't have access to a AC household current, no worries. Comes in handy in a pinch. Not for use to jump start your vehicle through this cord. Wire is just not large enough to provide sufficient amperage to the automobile battery.