Power Inverters converts your vehicle"s DC power to 120 volts AC household power. This is ideal for use with laptops, cell phones, digital cameras, and MP3 devices. Low battery shutdown prevents total battery drain. 1000 watts surge capacity and 500 watts maximum continuous power. The PI500BB box contains the following 500 Watt Power Inverter, 12V Vehicle Accessory Plug (Cig lighter cord for 100W or less), Set of Battery Clips (For direct connection to the battery, for 100W to 500W) and Instruction manual.