Engineered for extreme strength and easy assembly the K&H Kitty Sill is purrfect for any cat that enjoys basking in the sun. In fact this ingeniously designed cat perch can hold up to 40 pounds. The ultra-comfortable orthopedic foam and super soft fleece cover provide your cat with ultimate comfort while sunbathing in your window sill. The K&H Kitty Sill is available in both heated and unheated models. The heated Thermo-Kitty Sill includes a removable heater that provides the extra warmth your cat craves. Its internal thermostats warm to your cat?s body temperature when in use. No tools are needed for installation when using the hook & loop fasteners. Screws are also included for those who prefer a more permanent installation. This great K&H product is MET listed for safety (heated version) and includes a one year warranty.