Dialing button for setting the temperature: The place the finger points to is the current temperature value. ON/OFF Switch for System: ON/OFF Key to turn on/off of the thermostat. Working Mode Switch: HEATCOOL key to switch the heating/Cooling mode. Fan Speed Key: L-M-H, that is, Low speed-Moddle speed-High speed, Wind valve controller does not have this fLJnction. Description: MT01 series of thermostats are usually used on the commercial, industrial and civil constructi ons, which can control the fan l of air-conditioning, water valve and wind valveect. It can make the temperature balance in the setting range in the location, and all switches are manual switch. Very simple to manipulate. Colour: white Material: plastic Package Contents: 4 x Temperature regulator 4 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.