Dell Inspiron 11 (3147, Mid 2014) - Manual (Page 20)

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Keyboard
Physical Keyboard
Physical keyboards are used with laptop and desktop computers.
Laptops generally have a built-in keyboard. External keyboards are generally
used with desktop computers. Some keyboards may have features such
as keys for volume adjustment, application shortcuts, built-in touchpad,
programmable shortcut keys, backlight, and so on.
Keyboard Backlight
The backlit present on some physical keyboards illuminates the symbols
on the keys to allow for using the keyboard in dark environments. You
can turn on the backlight manually or configure the backlight to turn on
automatically when your computer is placed in a dark environment.
The backlit keyboard on Dell laptops have different lighting states. Press the
<Fn> and the right-arrow key to toggle between the various lighting states.
NOTE: Backlit keyboard may not be available on all computers. See the
Specifications of your computer at dell.com/support.