Converts vehicle's 12 Volt DC to 110/120 Volt AC. Features state-of-the-art circuitry to handle temporary high surge loads. Low power consumption ensures longer battery life. 90% efficient, solid state design means you get the most from your vehicle battery. Inverter automatically shuts down if voltage is too high or low, or if it overheats or overloads. Completely silent operation. No installation required. Keep one with your laptop computer. Do not exceed maximum wattage rating for inverter.