3. Compressor delay: This function is generally used for compressor refrigeration. If the temperature controller is used for refrigerator freezer, this value must be set. The general setting value is 3-6 minutes according to the back pressure of the compressor. APP to adjust, the adjustment range is 0 to 10 minutes 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 Celsius, the temperature difference is set to 2 Celsius, stop heating after heating to 40 Celsius, and enter the constant temperature mode , When the temperature drops to 38 Celsius, re-enter the heating mode, this value differs by 2 Celsius, this value can be adjusted by the host or APP 1. Temperature setting (ambient temperature required by the user): the user can adjust it on the thermostat or APP, the adjustment range is -40 to 99.9 Celsius 4. Temperature correction: used to correct the temperature value currently detected by the thermostat, the correction range is 0 to 10 degrees Celsius