The Warm A Pet Precision Thermostat Control Unit Maintains the chosen set temperature (say 25 degrees) and the variance can be set to 0.3 of a degree.

For example if the temperature is set at 25 degrees and the heat pad rises to 25.3 degrees, the unit will switch to "cool" or if the temperature of the heat pad drops to 24.7 degrees the unit switches to "heat" to constantly maintain the set temperature.

NOTE HEAT PAD SOLD SEPARATELY AND WILL ONLY WORK WITH WARM A PET HEAT PADS

warmapet warm-a-pet