Relay Output, Easy to Use: No wires needed, just plug the device into this temperature controller thermostat socket and set the parameters, it will work as programmed. It is CE certified. Food : 230 V AC; exit : 16A/230V max Temperature control function, accuracy 1%: temperature control range: -40~120. Set the start temperature and stop temperature and it will control the heater or cooler to run according to the schedule. (start temperature is higher than stop temperature, cooling; start temperature is lower than stop temperature, heating). This thermostat socket also supports temperature calibration. Timing function: This thermostat socket has timing and countdown function. You can choose a cycle timer mode to control the cycle of the device, or choose another countdown mode to turn the device on or off. Setting range : 0~99 hours and 59 minutes. Please note that the temperature control function and the timer function cannot be used at the same time. More functions: 5 modes to choose from (temperature control mode, F01 cycle timer mode, F02 countdown mode on, F03 countdown mode off, F04 countdown on and countdown off). Large LCD screen. temperature calibration. reset function. Data storage function, all setting parameters can be saved after power off. Wide range of applications: This temperature control socket is widely used in greenhouses, reptiles, incubators, terrariums, freezers, refrigerators, heaters, freezers, home brewing, breeding boxes, fermentation, heating pads and other temperature control systems. It can also be used as a loop and countdown timer.