【Easy to Use】Plug-and-play terrarium thermostat with relay output. Easy to program and safe to use. The thermostat socket supports readings in Celsius or Fahrenheit. Temperature control range: -40℃~120℃/-72℉~176℉. Temperature control accuracy: ±1%. Power supply voltage: 100~250V AC 50/60Hz. 【5 Control Modes】The heating and cooling thermostat has 5 control modes to choose from (Temperature control mode; F01 Cyclic timing mode; F02 Countdown on mode; F03 Countdown off mode; F04 Countdown on and off mode). 【Heating and Cooling】The thermostat socket can be set to start and stop the temperature to control the heating/cooling mode and controls the operation of the heater or cooler based on the setting. Start temperature > stop temperature, cooling begins; start temperature < stop temperature, heating begins. 【Other functions】The temperature controller has other functions: backlit LCD display; temperature calibration; factory reset; Data storage (which can save all current settings after