1. Automatic identification of working mode: The system automatically recognizes the working mode according to the start temperature/stop temperature; Start temperature stop temperature, cooling mode 'C'; start temperature Less than stop temperature, heating mode 'H'; 2. Cooling mode: When the detected temperature is 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 for a long time, there may be deviations, which can be corrected by this function, the actual temperature = measured temperature + calibration value; How to set start/stop temperature: 1. In the running interface, press and hold the 'TM+' button for more than 3 seconds to enter the startup temperature setting interface. You can use the TM+ TM- button to modify the parameters in the test. After the parameters are modified, wait for 6s to automatically exit and save; 2. In the running interface, press and hold the 'TM-' button for more than 3 seconds to enter the stop temperature setting interface. You can modify the parameters through the TM+ TM- button. After the parameters are modified, wait for 6s to automatically exit and save; Material: ABS colour:As shown Package Contents: 1 x Temperature humidity module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.