The Convergys converter turns your 12 V battery into a 230 V power supply to power or charge any device up to 300 W. It powers from the cigarette lighter socket or its battery clamps. In addition to its 230V socket, a USB port (5V) allows you to connect devices such as MP3 players or cameras. Thermal protection, ventilated. Overload and short circuit protection. Electrical under-voltage and over-voltage protection. (230V + USB).