Zilla Temperature ControllersZilla Temperature Controller has the ability to control any type of heating device (sold separately). Thermostat keeps temperature steady for optimum health and safety feature guards against overheating. Proper terrarium temperature is recommended for a reptile or amphibian's healthy, active life. Add a Zilla Temperature Controller to maintain a pet's terrarium at any preset temperature between 60 degrees and 105 degrees (F). Simply place the temperature probe in a terrarium using the included suction cup, then connect any type of incandescent heat source (heating device is not included). An added safety feature automatically shuts off the heating system if terrarium temperature exceeds 110 degrees (F) due to heater malfunction or excessive sunlight.