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 and 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 and calibration value 6. Parameter remote reading or 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.