To adjust the volume, press the "Menu" button on the right side of the Lenovo Mirage AR headset. Aim your gaze (look) at "Settings" and press button 1 on your controller to select. Look at the plus or minus sign on either side of the "Volume" meter and press button 1 to raise or lower the volume. To close the Settings menu, press the "Menu" button again.
Note: The Menu button is the third button located on the right side of the headset. If your phone ringer is in vibrate mode, you will not be able to raise the volume.