Its dual Thermotat 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 hook and loop fasteners. We also include screws for a more permanent attachment.All K&H heated beds and pads feature dual Thermotats and are designed to warm to your petnormal body temperature when he/she lies on the pad. When your pet is not on the pad, the heat will dissipate into the air and the surface temperature will vary according to the ambient air temperature. All K&H heated products are Thermotatically controlled to heat to 102 F, regardless of the size. Dual Thermotat simply means there are two internal Thermotats that will keep the surface of the bed at 10-15F above ambient air temperature when your pet is not on the bed. When your pet lies on the bed,itill warm to about 102 F.