Save fuel, reduce pollution, and still stay warm and comfortable. Almost 200 degrees of heat keeps your bunk area or camper warm and cozy without running your engine. Automatic low voltage alarm lets you rest without worrying about running your battery down. Adjustable thermostat. Uses 50 amp/hour. (Warning: Don't try using it under the covers, no matter how cold your feet are.) Requires PowerHunt Power Strip PNP-100A to Operate