LG ProBeam BU70QGA Owner's Manual page 28

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(Volume Button)
Adjusts the volume level.
(Aspect Ratio)
Selects the screen size.
Shows information on the current screen.
(Mute)
Mutes all sounds.
(Brightness Up/Down)
Adjusts the brightness of the display.
(Page Up/Down)
Moves to the previous or next screen.
(Picture Mode)
Selects the Picture Mode.
(Home menu)
Activates the Launcher.
(White Balance)
Enters the White Balance menu.