Dialing button for setting the temperature: The position the finger points to indicates the current temperature value. ON/OFF Switch for System: Press the ON/OFF key to turn the thermostat on or off. Working Mode Switch: Press the HEAT/COOL key to switch between heating and cooling modes. Fan Speed Key: L-M-H, which stands for Low speed, Medium speed, and High speed. Note that the wind valve controller does not have this function. MT01 series thermostats are commonly used in commercial, industrial, and residential buildings, and can control 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; others are not part of the package. Note: Lighting and display differences may cause slight variations in color compared to the actual product. Measurement may allow an error of +/- 1-3 cm.