This is the device that charges a car's battery from the comfort and safety of the driver's seat. Small enough to store inside a glove box, the 30-volt battery plugs into a car's 12-volt lighter outlet. The device jump-starts a car's battery in as little as 10 minutes, providing a two-amp "trickle" charge, even in temperatures as low as -10º F. A quick beep indicates when charging is complete. Reversing a switch allows the device to recharge in 30 minutes from a running car. It comes fully charged, providing up to five years of power. Includes a set of mini-jumper cables for motorcycles. 3" H x 3" W x 2 1/2" D. (2 lbs.)