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 HEAT/COOL 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 thermostats are commonly used in commercial, industrial, and residential applications, capable of controlling the fan, water valve, and wind valve of air-conditioning systems. It helps maintain temperature balance within the set range. All switches are manual. Simple to operate. Color: White. Material: Plastic. Package Contents: 1 x Temperature Regulator, 1 x English Manual. Only the items listed are included. Note: Lighting and display settings may cause slight color differences between the image and the actual item. Measurement error allowance is +/- 1-3 cm.