Now you can jump start a dead car battery without regular jumper cables. This portable jumper is easy to use. Just plug the small piece into the cigarette lighter of the car with the working battery, (make sure to keep the vehicle running so you don’t' drain the battery), and plug the large piece into the cigarette lighter of the car with the dead battery. Flip the switch to "Charge", and before you know it, the dead battery is able to start up again. Just as effective as jumper cables, but much easier to store in your vehicle.* This item is a compact size, and easy to store in any vehicle