Inkbird Digital Temperature Controller Thermostat & Timer Time Switch AC 100~240V,1200W Only Heating for Breeding, Planting ect. NO COOLING CONTROL NO COOLING CONTROL.There is only heating relay. It can be widely use in over-heat protection and automatic temperature control system of all sorts of electrical equipment for aquarium, pets breeding, hatching, fungus fermenting, and seed germination accelerating, etc. Only one relay and it extends two plugs which both are heating plugs, NO cooling plug. It can be set to two different temperatures with its function of dual time cycle setting during 24 hours according to the day and night, which can more suitable for the physiological needs of animals and plants. This plug and play product is designed with dual LCD display, and offers the optional display of Centigrade or Fahrenheit, which makes it more humanized temperature control. With large power output 1,200W, it's suitable for most applications. The temperature can be controlled more accurately with its function of temperature calibration and temperature hysteresis. There is only heating relay. It can be widely use in over-heat protection and automatic temperature control system of all sorts of electrical equipment for aquarium, pets breeding, hatching, fungus fermenting, and seed germination accelerating, etc.