Wagan EL2402 SmartAC 200W Power Inverter with USB Port The Wagan Smart 200-Watt USB Power Inverter provides one USB port and two 120-Volt AC outlets. This inverter is ideal for supplying power to laptops, mobile appliances and other AC and USB appliances. It comes equipped with built-in surge protection for car start up and shut down, and also provides overload and short circuit protection to keep you safe. This inverter can operate with the engine turned off, and will automatically shut down if the vehicle's battery gets low. This inverter provides a continuous 200-watt supply of power, with a peak surge power of 500 watts.