The Leopard Thermo-Kitty Bed has a dual thermostat, 4 watt heating unit buried within its thick premium polyfil pillow base. It warms the surface 10-15 degrees above ambient air temperature when not in use. When your pet lies in the bed it warms to your pet"s normal body temperature to keep them cozy warm. The washable cover comes in two colors and is attractive in any room in the house. Indoor use only, UL listed, one year warranty.