Muting/Unmuting The Headset's Microphone; Changing The Volume - Sennheiser MM 200 Instruction Manual

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Muting/unmuting the headset's
microphone
To mute the headset's microphone during a
call:
Press the Play/Pause button
seconds.
A mute indication beep is heard in the head-
set every 4 seconds while the microphone is
muted.
To unmute the headset's microphone:
Press the Play/Pause button
seconds
A confirmation beep is heard in the headset.
The microphone works as usual.

Changing the volume

The headset manages 3 different volume
settings independently of each other:
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for 2
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for 2