Adjusting the volume, Muting/unmuting a call, Adjusting the volume muting/unmuting a call – Dell Pro Stereo Headset UC300-Lync Optimised User Manual

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Setting Up Your Headset

Adjusting the Volume

Use the “+” and “–“ button located at the center of the call control unit
to adjust the volume. Press “+” to increase the volume level and “–” to
decrease the volume as shown below.

Muting/Unmuting a Call

Press the mute button to mute and un-mute the microphone as shown
below. Whenever the microphone is muted, a red LED glows indicating that
the microphone is muted, and whenever the microphone is un-muted, the
red LED stops glowing.