Fangrui Product Details 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 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 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 4. Temperature Correction: Used To Correct The Temperature Value C