Halo Automotive HA-i400S 400 Watt Power Inverter converts 12-volt DC power from a vehicle battery to 120-volt AC power. Simply plug the inverter into your vehicle’s DC outlet and connect your device to the inverter’s AC outlet or USB port which provides on-the-go household power in the vehicle. Great for charging cell phones, powering lap tops, powering video games, 20 inch TV/VCR combo and more! The HA-i400S has fuse surge, overload, low battery voltage, over battery voltage protections, Power ON/Off switch, light indicator when unit is ON and Fault light indicator, Modified Sine Wave Technology insures strong, adaptable and stable load. High tech achieved: Input & Output Isolation avoid electric shock! For DC12V and Car & Marine battery ONLY, not applied for DC24V and airplane use!.