Its dual thermostat heating unit is buried deep within super soft orthopedic foam and is removable for year round comfort. The heater is pre?set to keep the sleeping surface 12° to 15° above ambient air temperature and warms to your kitties natural body temperature when they lie on it. No tools are necessary for installation when using the provided Velcro-style fasteners. We also include screws for a more permanent attachment. One year limited warranty. Features: Recommended for indoor use Uses only 6 watts Sturdy design will support the largest of cats Removable heater, washable cover Orthopedic sleeping surface MET Listed 1 year warranty Dimensions: 14" x 24" x 9"