Copeland Engineering's Power Tamer controls the amount of battery drain with a convenient programmable timer. Set the Power Tamer to shut off your auxiliary equipment such as radios, computers and control panels at the time you specify (15 minutes to 31 hours). Your auxiliary equipment will shut off at the same time after you turn off your vehicle. It's digital design will give you years of trouble free service. Years of testing over a wide range of temperature and voltage ranges insures reliability and allows it to be transferred to future vehicles.