To adjust the volume using the Fn key
Press the F3 key while holding down the Fn key to turn down the volume. Press
the F4 key while holding down the Fn key to turn up the volume.

To turn off the volume using the Fn key
Press the F2 key while holding down the Fn key to turn off the volume of the
speakers and headphones.
Press the Fn+F2 keys again to turn on the volume.
Alternatively, press the Fn+F3 or Fn+F4 keys to turn on the volume.

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