The CPS100BU Inverter converts 12v DC automobile power to standard 120v AC home power - up to 100 watts. Simply plug the inverter into a 12v DC outlet (cigarette lighter outlet) and you're ready to go. Its compact design and convenient 150-degree swivel head is designed to fit in all universal cigarette lighter receptacles. It is equipped with one 3-prong outlet and has built-in automatic shutdown to protect your vehicle's battery. Full-time surge protection guards against power fluctuations from vehicle startup and shutdown. It's the perfect device to power all your mobile/consumer electronics, small appliances, emergency equipment, and portable tools. It also includes a USB port for changing your mobile electronics.