1. Heating mode 'H':When the detected temperature is less than or equal to the set temperature - the hysteresis temperature, the relay is turned on, and the heating equipment starts to work;When the detected temperature equal the set temperature, the relay is disconnected and the heating equipment stops working; 2. Cooling mode 'C':When the detected temperature equal set temperature + hysteresis temperature, the relay is turned on, and the refrigeration equipment starts to work;When the detected temperature is less than or equal to the set temperature, the relay is disconnected and the refrigeration equipment stops working; 3. High temperature alarm function ALA:When the actual temperature is or equal to the alarm temperature, the system will turn on the sound and light alarm, disconnect the relay, and stop the sound and light with any key;4. Delay start OPH:When a normal heating or cooling work is completed, the system starts timing , and only when equal OPH can the system perform round of heating or cooling work; 5. Temperature correction function OFE (-10.0~10.0Celsius):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;6. Parameter remote read/set:Parameters such as start temperature, stop temperature, and temperature correction can be set through UART; 7. Real-time temperature report:If the temperature reporting function is enabled, the product will transmit the detected temperature to the terminal through UART at 1s intervals, which is convenient for data collection;8. Relay enable (default on):If the relay enable is turned off, the relay remains disconnected;9. Factory reset:Press the STOP and SET keys at the same time for more than 3S to restore the factory settings; Working mode/setting temperature/return temperature setting: 1. In the running interface, short press the SET button to enter the quick setting interface; 2. After entering the quick setting interface, short press the SET button to switch the parameters to be set (working mode/set temperature/return temperature); 3. Through the UP DOWN key, modify the parameter value, support short press/long press; 4. Press and hold SET for more than 3S or continue for 6S without any key operation, exit the quick setting interface, and save the parameters; Alarm temperature/delay start setting/temperature correction: 1. In the running interface, long press SET for more than 3s to enter the parameter setting interface; 2. After entering the parameter setting interface, short press the SET button to switch the parameters to be set (alarm temperature/delay start setting/temperature correction); 3. Through the UP DOWN button, modify the parameter value, support short press/long press; 4. Press and hold SET for more than 3S or continue for 6S without any key operation, exit the parameter setting interface, and save the parameters; Colour:As shown Material: PCB Package Contents: 1 x XY-T01 Digital Thermostat Digital temperature 1 x cable 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.