The Duracell Instant Jumpstart System is an easy-to-use power solution when dealing with dead battery emergencies, and eliminates the need for a second vehicle to boost your battery. Its built-in emergency light allows you to see under the hood in the dark, and the reverse-polarity indicator ensures the included jumper cables are correctly connected to the battery terminals. The 400 cold-cranking amps will jump-start most vehicles. The Duracell Instant Jumpstart System also features one DC outlet so you can power any 12-volt device.