The Hydor Hydroset Electronic Thermostat regulates the temperature of aquariums when used with the appropriate heating device (we recommend using it with the Hydor Hydrokable). The Hydroset is equipped with an independent heating probe that works in water or air. Simply attach the appropriate heating device, set the desired temperature, and the Hydroset regulates the heating device by the use of accurate electronic circuitry. For devices up to 500W.Features:Control Range: 65-95 degrees FahrenheitIndependent probe working both in the water and in the air (ideal for aquarium terrariums)Setting of temperature controlled by an electronic circuit for increased accuracyAvailable in two versions: with or without electronic displayConnects to any heating cable