Dell Inspiron 15 3000 Series Setup And Specifications page 22

Function key
The Fn key is also used with selected keys on the keyboard to invoke other
secondary functions.
Table 21. List of keyboard shortcuts
Function key
22
Redefined key (for
multimedia control)
Behavior
Turn off/on wireless
Pause/Break
Sleep
Behavior
Play/Pause
Play next track/chapter
Switch to external display
Search
Toggle keyboard backlight
(optional)
NOTE: Non-
backlight keyboards
have F10 function
key without the
backlight icon and
does not support
toggle keyboard
backlight function.
Decrease brightness
Increase brightness