Internal thermostats automatically adjust the Pet Bed Warmer's temperature as needed to create a comfortable resting area for dogs and cats. They're pre-set to heat to your pet's natural 102°F body temperature when he/she lies on the pad. When plugged in but not in use, the Pet Bed Warmer will maintain a temperature 10-15°F greater than the ambient room temperature. The Pet Bed Warmer is the essence of simplicity and has no on/off switch to monitor. Plug it in and the product will begin to warm automatically. Its soothing, gentle heat will not exceed the natural body temperature of a dog or cat, allowing your pet to enjoy hours of warmth.