"The Outdoor Heated Kitty Pad is an essential source of warmth for any cat that spends time out doors. UL listed for safety, the internal thermostat keeps the surface nice and warm even in the coldest of temperatures. High-impact ABS plastic makes pad durable, easy to clean and water resistant. Place in a shed, garage, barn or anywhere outdoors. Sold with 12.5"" X 18.5"" Outdoor Heated Pad Cover."