Reptiles are ectothermic and require heat from an external source in order to optimally regulate their body temperature. Most reptiles utilise both the direct heat radiated by the sun and the transferred heat from surfaces that have been warmed by the sun, such as branches, rocks or other heat-storing structures. Creating a species-appropriate temperature gradient in a terrarium is an important factor in keeping reptiles successfully. With the Exo Terra electronic thermostat (ON/OFF, 100W/300W) you can create a well-controlled heat system. It allows you to maintain the required temperature conditions similar to those in a desert or tropical environment. The thermostat also helps to avoid overheating on hot summer days or overcooling on cold winter nights. The electronic triac switch keeps the temperature at the preset value and prevents temperature fluctuations in the terrarium. Connect your substrate heater, heat cable or ceramic heater to the Exo Terra Thermostat, set the desired temperature and place the heat sensor in the desired location. The red LED heat indicator lights up when the heater is heating and goes out when the desired temperature has been reached. The thermostat's recessed switch prevents accidental temperature changes when the appliance is touched. The waterproof remote sensor can easily be used in very humid terrariums and aquatic environments. The Exo Terra Thermostat should be set according to the needs of the animals. Research the optimum temperature range to create the correct temperature gradient for thermoregulation of your specific reptiles in your terrarium.