Thermostatically controlled outlet works with any 120V electrical device to turn the power to the device on and off according to ambient air temperature. When temperatures fall below 35° F., the Thermo Cube will activate, powering up the electrical device. When the temperatures rise above 45° F., it will automatically shut the device off. Saves electricity and wear/tear on your equipment. Typical applications include: well house heaters, greenhouse heaters, pond deicers, heat lamps, heat tape and engine/battery heaters. UL and SA listed. Operates 2 devices.