How to Use Turning on/off Adjusting the display's brightness Press the power button to turn on/off the purifier. Press the display on/off button on the back of the purifier to cycle through its brightness levels: on, dim, and off. Switching mode While the purifier is on, press the mode switch button to cycle through modes. Enabling/disabling the child lock function The child lock function can only be enabled via the app. Once enabled, the screen will flash and display as shown in Figure A. To disable the child lock function, press and hold the mode switch button for seven seconds until you hear a notification sound. Then the screen will display as shown in Figure B. Figure A Figure B 6