1. Automatic identification of working mode: The system automatically recognizes the working mode according to the start temperature/stop temperature; Start temperature Greater than stop temperature, cooling mode 'C'; start temperature Less than stop temperature, heating mode 'H'; 2. Cooling mode: When the detected temperature is greater than or equal to the starting temperature, the relay is turned on, the red indicator light is on, and the refrigeration equipment starts to work; When the detected temperature is less than or equal to the stop temperature, the relay is turned off, the red indicator light is off, and the refrigeration equipment stops working; 3. Heating mode: When the detected temperature is less than or equal to the starting temperature, the relay is turned on, the red indicator light is on, and the heating equipment starts to work; When the detected temperature ≥ the stop temperature, the relay is turned off, the red indicator light is off, and the heating equipment stops working 4. Temperature correction function OFE (-10.0 - 10.0℃): When the system works compatible with a long time, there may be deviations, which can be corrected by this function, the actual temperature = measured temperature and calibration value; How to set start/stop temperature: 1. In the running interface, press and hold the 'TMand' button compatible with more than 3 seconds to enter the startup temperature setting interface. You can use the TMand TM- button to modify the parameters in the test. After the parameters are modified, wait compatible with 6s to automatically exit and save; 2. In the running interface, press and hold the 'TM-' button compatible with more than 3 seconds to enter the stop temperature setting interface. You can modify the parameters through the TMand TM- button. After the parameters are modified, wait compatible with 6s to automatically exit and save; Material: ABS colour: