Samsung NP700Z5C-S04US manual Controls the volume, That support the keyboard backlight feature

Keyboard

Chapter 3. 47

Using the computer

Shortcut Keys		Name	Function
		Volume Control	Controls the volume.
			Controls the brightness of the keyboard backlight. This function is only available for models
			that support the keyboard backlight feature.
		Keyboard Backlight	•• If you use the buttons in a bright location, the “The keyboard backlight brightness
		Brightness Control
		(Optional)	cannot be changed due to too bright ambient illumination” message appears.
			•• When it is bright or the illumination sensor is turned on, select Settings > General >
			Keyboard Backlight and 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.)