bayite AC 110V Fahrenheit Digital Temperature Controller 10A 1 Relay with Sensor KEEP TEMPERATURE IN DESIRED RANGE: It's on/off control mode. Turn on your device at a degree and turn it off at another degree. The difference of the 2 degrees can be minimum 1 and maximum 25. HEATING OR REFRIGERATION WORKING MODE: Switch between heating mode and refrigeration mode according to the device your need. LONG SENSOR CABLE: 3m/9.8ft. Size of the WATERPROOF probe head: 4mm*20mm WIDE RANGE OF USES: seedling heat mat, home brewing, aquarium, pet breeding, incubation, BBQ, fermentation, accelerating germination, electric radiator, electric oven, etc. With compressor delay protection function for refrigerating control