The ACMobile 140CHI Inverter converts 12V DC automobile power to standard 120V AC home power - up to 140 watts. Simply plug the inverter into a 12v DC outlet (cigarette lighter outlet) and you’re ready to go. It’s the perfect solution for powering electronics anywhere a 12V power source is available. It also has full-time surge protection that guards against power fluctuations from vehicle startup and shutdown. The 140CHI is ergonomically designed to fit in any standard sized cupholder (for convenient placement), but also lays flat for dashboard or seat mounting.