"57 Watts, 120 Volts,17"" x 24"". Provides the soothing heat that is particularly helpful for older pets. Approved for indoors or outdoors, our Heated Pet Mats are constructed of durable, weather-resistant plastic with welded seams for safety and longer life. Offered in four sizes: extra small, small, medium, and large. A washable, fleece-like cover is also included. Our unique, patented design allows air flow completely around the heating element to eliminate hot spots common with other plastic mats. Our mats are designed to be used in dog houses, garages, kennels, or anywhere your pet needs added warmth. cULus Listed."