Samsung NP540U4E-K01US - Manual (Page 52)

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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. If there is a brightness sensor in your model, you
can adjust the backlight brightness.
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.)
Depending on the model, when the wireless network device is turned on, the button’s LED
lights up. (Optional)
Keyboard