Porta-Jump™ charges your battery through the cigarette lighter socket. You never have to leave your vehicle, wait for help to arrive, scramble under a dirty hood or use jumper cables again! This safe and efficient device is re-usable, not like some of those one-time-use boosters. Works on cars, vans and light trucks. Put one in your glove compartment today! Comes with case and cable. 2 ½” x 2 ½”.