Dell AE2 User Manual page 16

1. While in a Voice-over Internet Protocol (VoIP) call, press the mute button
on the headset to mute the microphone. You will hear two audible tones to
indicate that the microphone is on mute.
2. To unmute the microphone, press the mute button again. You will hear a
single long audible tone to indicate that the microphone have been
enabled.
To adjust the volume of your headset, use the speaker adjustment setting on your
computer, the volume control within the application software that you are using,
or both.
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