Thermostat not only can detect the temperature inside the terrarium, but also help to regulate the temperature according to the timer were set for the day time and night time by heating or cooling down the temperature inside the terrarium with the appropriate accessory linked. Programmable for up to 8 turn-on and turn-off times. continuous display of temperature, real time and chosen function. Control temperature range:0-50°C,selectable switching delay 1-15°C. Battery prevents loss of date in case power failure.