A:AnswerThere is an option to disable the speaker or reduce the volume under On-Screen Display (OSD) menu-->Audio.
You can access the menu by pressing the menu button on the front panel of the monitor.
A:AnswerNo, this monitor does not have a built in webcam or microphone. You can check the Dell P2418HZ https://bit.ly/3nCVarC This monitor has both a built-in webcam and a microphone.