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.providing on-the-go household power in the vehicle. Dual 110V AC oulets and Dual USB ports 3.1A totally, one with 1A and the other 2.1A for iPad and other larger devices fast charging Short circuit,overload,overheat,low battery voltage,over battery voltage Protections, Full protection features and Auto-shutdown keep your appliance and car from damage of overheating, over load , low load, short circuit, low voltage and over voltage. High tech achieved: Input & Output Isolation avoid electric shock ! Built-in fuse & cooling fan. Resum working after protections. For DC12V and Car ONLY, not applied for DC24V and airplane use !