Dell Inspiron 13 (7347, Mid 2014) - Manual (Page 19)

Keyboard
Shortcut Keys
Mute audio
Decrease volume
Increase volume
Play previous track/chapter
Play/Pause
Play next track/chapter
Switch to external display
Open Search charm
Toggle keyboard backlight
Decrease brightness
Increase brightness
Turn off/on wireless
Pause/Break
Sleep
Scroll lock
Toggle Fn‑key lock