Additional Details ------------------------------ Product description: The Thermo Cube is a unique, patented electric device that plugs into a standard, 15 amp, outlet and automatically turns on according to power out of power from the air temperature, saving you money using 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 0 af, off at 10 af and is ideal for automotive applications, heaters, includes engine and battery. One year limited warranty.