The Farm Innovators Thermocube with double receptacles has an internal thermostat that will automatically turn the power on when the temperature dips below 35 degrees and will shut off again when temperatures reach 45 degrees. The plug is designed for home and or agricultural use and is only to be used with GFCI outlets. Use with stock tank heaters, heated water founts, heat lamps, engine heaters, boats, RV, and autos. Cut down on energy costs by running heated applications only when you really need them.