Samsung NP680Z5E-X01US - Manual (Page 53)

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Chapter 3.
Using the computer
Shortcut Keys Name Function
Volume Control Controls the volume.
Keyboard Backlight
Brightness Control
(Optional)
Controls the brightness of the keyboard backlight. This function is only available for models
that support the keyboard backlight feature.
Silent Mode Reduces the Fan noise so that users can use the computer without hearing noise.
or
Airplane Mode
Turns all wireless network devices on or off.
(Only for models with a wireless network device.)
Keyboard