Relay output Plug-and-play design, relay output. Easy to program and safe to use. This Thermostat Plug Outlet can be displayed in Celsius or Fahrenheit. Temperature control range:-40~120/-72~176. Power supply: 100~250V AC 50/60Hz; Output: Max 16A/230V. Temperature control function Temperature control range:-40~120, temperature control accuracy: 1%. This digital temperature controller plug is easy to program. Set start temperature and stop temperature, it will work in heating or cooling mode as programmed. (start temperature > stop temperature, cooling; start temperature < stop temperature, heating). This thermostat plug also supports temperature calibration for more precise results. Timing function F01~F04 modes for cycle timing and countdown: F01 Cycle Timer mode; F02 Countdown ON mode, F03 Countdown OFF mode, F04 Countdown ON and Countdown OFF mode. You can choose F01 mode to control the device to work in cycles, or choose F02~F04 modes to countdown to turn on or turn off the device. Set range: 0~99 hours 59 minutes. Please note that this thermostat plug only works in one mode. More functions 1.7m NTC 10K temperature sensor probe. Large LCD display. Temperature calibration. Reset function. Data storage function that all parameters set can be saved after power off. Wide Range of ApplicationThis thermostat plug socket is widely used for greenhouse, reptile, incubator, terrarium, freezer, refrigerator, heater, fridge, homebrew, vivarium, fermentation, heat mat, and other temperature-controlled system. It can also be used as a timer for cycle timing and countdown.