Adjusting Audio Volume - Fujitsu CD5425 Owner's Manual

[MUTE] button
[AUDIO CONTROL] button

Adjusting audio volume

Turn the [AUDIO CONTROL] button to the left or right.
Turn to the right: Increases the volume.
Turn to the left: Decreases the volume.
Press the [MUTE] button for less than one second to cut the volume or
restore it instantly.
Do not adjust the volume or other controls while driving the vehicle. Do
so only while parked in a safe location.
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Basic operation