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 of the thermostat. Working Mode Switch: Press 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.simple to manipulate. Colour: 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 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.