Dell MH3021P User Manual page 12

Adjusting volume:
When adjusting volume, the ring of LEDs
will temporarily light up in white to indicate
volume level. When volume up is pressed,
LED will light up in clockwise direction. When
volume down is pressed, LED will go o in
anti-clockwise direction.
Hanging up a call:
When a call ends, center top LED will return
from green to white.
For Zoom, press "Leave Meeting" from the
app.
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