The Elite 400W PRO Pure Sine Wave DC to AC Power Inverter by Wagan Tech allows you to power or charge most laptops, USB devices, and other electronics in your vehicle or boat with the same clean power you get from the AC wall outlets at home. Unlike inverters that produce modified sine wave power, the Elite 400W PRO converts DC power to pure sine wave AC, which allows your sensitive electronics, such as audio/video systems, computers, and communications equipment, to operate cooler, quieter, and more efficiently.