1. Heating mode 'H': When the detected temperature set temperature - hysteresis temperature, the relay is turned on and the heating equipment starts working; when the detected temperature set temperature, the relay is disconnected and the heating equipment stops working; 2. Cooling mode 'C': When the detected temperature set temperature + hysteresis temperature, the relay is turned on and the cooling equipment starts working; when the detected temperature set temperature, the relay is disconnected and the cooling equipment stops working; 3. High temperature alarm function ALA: When the actual temperature alarm temperature, the system turns on the sound and light alarm, and disconnects the relay, and any key stops the sound and light; 4. Delay start OPH: After completing a normal heating or cooling work, the system starts timing T. Only when T OPH, the system can carry out round of heating or cooling; 5. Temperature correction function OFE (-10.0~10.0): The system may have deviations when working for a long time. This function can be used to correct the actual temperature measurement temperature + calibration value; 6. Parameter remote reading/setting: Parameters such as start temperature, stop temperature, and temperature correction can be set through UART; 7. Real-time temperature reporting: If the temperature reporting function is turned on, the product transmit the detected temperature to the terminal via UART at intervals of 15 seconds to facilitate data collection; 8. Relay enable (default on): If the relay enable is turned off, the relay remains disconnected; 9. Restore factory settings: the STOP and SET keys at the same time for more than 3S to restore factory settings; Colour: Green Material: plastic Package Contents: 1 x XY-T01 Digital Temperature Controller Module Only the above package content, other products are not included. Note: Light reflection 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.