This article explains the different power/function buttons, features, and gestures

Power button On-Screen display menu features

• • If the power button is pressed for more than 5 seconds, a pop-up screen menu will appear. 

Gestures

Note: The following gesture will only work if the trigger buttons are set as “Volume up and down”. See Key Remap from Android Settings.

• Pressing power button twice will activate Camera.
  • To enable or disable this feature see Android Settings on System → Gesture in the user manual.
• Pressing power button + Volume Up will activate notification volume to vibrate or Mute depending on the settings.
  • To enable or disable this feature see Android Settings on System → Gesture in the user manual.
• Pressing power button + Volume Down will activate screenshot.