This Komodo Thermostat provides precision when using any thermostatically controlled heat source. The On/Off Thermostats are guaranteed to maintain the required temperature within 1 degree Celsius. How they work: The On/Off stats are the least expensive and the most basic thermostat in the Komodo range and they regulate the temperature by switching the heater on and off. If the senor reads a temperature that is too warm, it switches the heater off. Too cold, it switches the heater on. These are ideal and will give every user peace of mind that their reptile is in a comfortable and controlled environment. We recommend the use of the 100W Thermostat with our Advanced Heat Mats whilst the 300W Thermostat can be used with any of our incandescent Spotlight Bulb and Ceramic Heat Lamps. This thermostat is for non light emitting heat sources and provides perfect reptile care, from desert to rain forest environments. It perfectly monitors air and surface temperatures for an accurate thermal gradient. It also has a adjustable tamper-resistant dial with audible and visual operational indicators. This cable size is 85cm. Controls heat sources up to 100W Precisely monitors air & surface temperatures Perfect reptile care, from desert to rain forest environments Accurate to + / - 1 degree Centigrade