Additional Details ------------------------------ Product description: The Thermo Cube is a unique, patented electrical device that plugs into a standard 15 amp electrical outlet and turns power on automatically according to outside air temperature, saving money by using power only when temperatures require heating or cooling. There are five models available with different temperature ranges to choose from. Each unit has two receptacles for use with more than one electrical device. Cold weather model TC-1 turns on at 0AF, off at 10AF and is ideal for automotive applications, including engine and battery heaters. One year limited warranty.