1. Temperature setting (user required temperature): The user can set it on the thermostat or APP, the setting range is -40 to 99.9 Celsius 2. Temperature difference setting: Set the difference between the heating and cooling target temperature when working at a constant temperature; for example, the target temperature is 40 degrees Celsius, the temperature difference is set to 2 degrees Celsius, stop heating after heating to 40 degrees Celsius and enter the constant temperature mode. When the temperature drops to 38 degrees Celsius, return to the heating mode, this value differs by 2 Celsius, this value can be adjusted by the host or APP 3. Compressor delay: This function is generally used for compressor refrigeration. If the temperature controller is used for refrigerator-freezer, this value needs to be set. The general setting value is 3 to 6 minutes depending on the compressor back pressure. APP to adjust, the adjustment range is 0-10 minutes 4. Temperature correction: used to