Dell P2418HZM 23.8" 16:9 IPS Monitor - Manual (Page 35)

Operating your monitor |
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To end an active voice or video call, press the Hook button.
2. Mute
To mute the audio, press the
Mute button. The mute-button light turns on when
audio is muted.
3. Volume Down/Volume Up
To adjust the volume, press the
Volume Down or Volume Up buttons. The
activated OSD shows the numeric values of the volume level.
4. Microphone Mute
To mute the microphone, press the
Microphone Mute button. The microphone-
mute-button light turns on when the microphone is muted .