When your car vehicle battery is dead, the Black & Decker Battery Booster is here to get you back on the road. Simply plug the booster into the 12 Volt DC outlet or clamp it directly to the battery. Turn it on and start your car in minutes. The Black & Decker Battery Booster includes a multi-color power / status indicator to let you know when to start your vehicle. It also includes a 2 amp USB charging port to use as a portable power source for charging cell phones, tablets or any electronic device that needs power through a USB port. The Power Booster also has an emergency LED light built in.