9ENSetting target humidityTap the button to set the target humidity level to 40%, 50%, 60% or ---.» If you have not set a humidity level, the default target humidity is 50%.» When the ambient humidity reaches the target level, the appliance will automatically switchto the lowest fan speed. If the humidification sensor detects that the current humidity dropsbelow the target level, the appliance will switch back to the previous fan speed automatically.» The "---" display indicates that no humidity is set, and the appliance will continue to humidifythe air until the RH (Relative Humidity) level reaches 70%.» After removing the water tank, the appliance goes to the Purification ONLY modeautomatically and you can't set the humidity level. Tap the button, blinks on the screen.Display switch• 2-in-1 mode ( ): Tap the button to switch to view PM2.5 (particles smaller than 2.5 microns),IAI (Indoor Allergen Index) and current humidity.» The appliance displays the current humidity by default.1 2• Purification ONLY mode: Tap the button to switch between PM2.5 and IAI levels.» The appliance displays the PM2.5 level by default.