It is designed to invert 12 VDC to 115 VAC. It is 90% efficient with 2 AC outlet. Measures 6.1 inch length x 6 inch width x 2.2 inch height. Features thermal, battery overload, short circuit, earth fault protection circuit and low battery input alarm. Includes a USB charging port. Connect through any 12 Volt lighter socket in your car, boat, truck or RV.