Dell MH3021P User Manual page 8

4. MH3021P has the Speakerphone and Microphone,you can use it for communication after
connecting your mobile adapter with the notebook.
Answer
call
Volume
down
NOTE: MH3021P buttons work well with Skype for Business and Zoom.
Microphone Mute/Unmute
Answer call
End call/Reject call
Speaker volume up
Speaker volume down
Mute/Unmute microphone Tap the Mute microphone button
Tap the Answer call button
Tap the End/reject call
button
Tap the volume up button
Tap the volume down button
End call/
Reject call
Volume up
8