Air Purifier Night Mode

Air Purifier Night Mode:  If you wish the LCD on the left hand side of the panel to turn off, press the Auto button and hold down for 3 or more seconds to set the panel on Sleep mode. Press Auto button again and hold down for 3 or more seconds to turn the LCD back on.

Source: http://byinternational.com/air-purifier-night-mode/

Electrostatic Air Purifiers Travel-Size Air Purifiers