Dual thermostats regulate the temperature in this unique Thermal pet bed. The heater keeps the surface temperature of the bed approximately 12 to 15 degrees above ambient air temperature. When the pet lies down it warms to a comfortable 102 degrees . The heater easily removes for washing, which makes the bed useable year round. UL and CUL listed. This bed is recommended for indoor use. A great bed for pets, keeps them warm and cozy. A must for an older dog.