Sturdiest, most attractive, easy to assemble cat sill on the market.  Adjustable to any windowsill using provided Velcro� fasteners. Screws are provided for more  permanent attachment. Supports over 40 pounds. The surface of the bed will remain 12� to 15� above ambient air temperature and warm to 102� when in use.  Dual thermostat.  Super soft orthopedic foam.  Washable faux lambskin. Size - 14" x 24" surface, 6 watt. Recommended for year-round indoor use.  Limited one-year warranty.