True sine wave inverter is designed to invert 12 VDC to 120 VAC. It is 89 to 90% efficient with 2 GFCI Outlet. Measures 4.5 inch height x 11 inch width x 15.4 inch length. It has 1800 Watt output rating and 2900 Watt surge rating. Features over temperature shutdown and automatic overload protection, over voltage and under voltage protection, short circuit and AC back feed protection. Includes a backlit LCD display panel and transfer switch.