Want to use your 12 V cool box in your truck or boat?The clever ProCar voltage converter converts a 24 V DC supply to 12 V DC to enable you to run an electric cooler that's normally powered by your car's cigarette lighter through the on-board supply of a truck or boat.The voltage converter simply plugs in between the on-board outlet and any 12 V 60 W device - not just cool boxes. The ProCar voltage converter is ideal for use with portable navigation systems, CD players, television sets, electric mugs, etc.Your in-car cool box just stepped out the car and into your HGV - with the ProCar voltage converter.