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/off the thermostat. Working Mode Switch: Press HEATCOOL key to switch between heating and cooling modes. Fan Speed Key: L-M-H, that is, Low speed - Medium speed - High speed. Wind valve controller does not have this function. MT01 series of thermostats are typically used in commercial, industrial, and residential buildings, capable of controlling fan coils in air-conditioning systems, water valves, and wind valves. It maintains temperature balance within the set range at the location. All switches are manual, making it very simple to operate. Color: White Material: Plastic Package Contents: 1 x Temperature regulator 1 x English manual Only the above package content; other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture to be slightly different from the real thing. Measurement allowed error is +/- 1-3 cm.