Temperature setting (ambient temperature required by the user): The user can adjust it on the thermostat or via the app, with an adjustment range of -40 to 99°C. Temperature difference setting: Sets the difference between the heating and cooling target temperatures during constant temperature operation. For example, if the target temperature is 40°C and the temperature difference is set to 2°C, heating stops when reaching 40°C and enters constant temperature mode. When the temperature drops to 38°C, it re-enters heating mode. This value can be adjusted via the device or app. Compressor delay: This function is typically used for compressor refrigeration systems. If the temperature controller is used in a refrigerator or freezer, this setting must be configured. The typical setting range is 3–6 minutes depending on compressor back pressure. Adjustable via app, with a range of 0 to 10 minutes. Temperature correction: Used to correct the temperature value currently detected by the thermostat. The correction range is ±10°C. Product name: Thermostat Product model: DTC1201 Supply voltage: AC 110–230V Temperature range: -40°C to 99°C Temperature measurement accuracy: ±1°C (-40°C to 70°C) Sensor cable length: 100cm Sensor cable type: NTC Size: 93mm x 56mm x 34mm Output capacity: Cooling (10A/250VAC), Heating (10A/250VAC) Indicator status: Cool indicator (Cool and Heat indicators cannot be on simultaneously): On: Cooling in operation Off: Cooling off Flashing: Press delay Heat indicator: On: Heating in operation Off: Heating off Set indicator: On: Parameter setting mode Data indicator (yellow light: network status): Data transmission indicator Net indicator (indicates whether the app is successfully connected to the device): On: Online Blinking: Offline Caveat: This thermostat must not be used in water or excessively humid environments. It is prohibited for use in high-temperature, strong electromagnetic interference, or strongly corrosive environments. Assembly: Ready to use Color: Black + white Material: Plastic Package Contents: 1 x Wireless digital temperature controller 1 x Temperature sensor cable Only the above package contents are included; other products are not included. Note: Lighting and different displays may cause slight variations in the color of the item in the picture compared to the actual product. Measurement error allowance is ±1–3cm.