The Outdoor Heated Kitty Pad is an essential source of warmth for any cat that spends time out doors. Its internal thermostat keeps the surface nice and warm even in the coldest of temperatures. Place in a shed, garage, barn or anywhere your outdoor kitties spend time. It's made of rugged ABS plastic and a free fleece cover is included. Recommended for indoor and outdoor use. There is no replacement heater for this item. The heater is enclosed in a sealed unit since it is outdoor rated. 12.5x18.5x0.5