Breeders, pet owners, and veterinarians have been using Lectro?Kennels to warm pets for more than 40 years. This new sleek, smooth design is now more comfortable and durable than ever! Constructed of rugged ABS plastic with a steel wrapped cord, the Lectro?Kennel can lie flat on the doghouse floor or be attached to the wall. An internal thermostat keeps the temperature of the pad warmed to your pet's normal body temperature. Lectro?Kennel also comes with a free removable, washable fleece cover. Indoor or outdoor use.?