Dialing button for setting the temperature: The place the finger points to is the current temperature value. ON/OFF Switch for System: Press ON/OFF Key to turn on or off the thermostat. Working Mode Switch: Press HEATCOOL key to switch between heating and cooling modes. Fan Speed Key: L-M-H, which stands for Low speed, Medium speed, High speed. Wind valve controller does not have this function. MT01 series thermostats are commonly used in commercial, industrial, and residential buildings. They can control the fan of air conditioning, water valve, and wind valve. They help maintain temperature balance within the set range. All switches are manual, designed for simple operation. Color: White Material: Plastic Package Contents: 1 x Temperature regulator 1 x English manual Only the above package content is included; other products are not included. Note: Lighting and different displays may cause the color of the item in the picture to vary slightly from the actual product. Measurement error allowance is +/- 1-3 cm.