* Fast Heating: A powerful heater with built-in fan circulates hot air to heat up to 150 ft³ of pet housing. Using the low (400W) or high (800W) heating levels, you can switch the heat level depending on how cold it is outside. * Pet Friendly: Made of heat-insulating metal, you don't worry about scalding your dog when using it. The 9.8 ft. chew-proof power cord prevents even the most playful puppy from biting and damaging the wire. * Safe & Easy to Use: With an IPX4 waterproof controller, you can easily adjust the heating level from outside the dog house. This dog heater also comes with built-in overheating protection and has passed UL test so your pet can stay comfortable and warm in the winter.