Go to More options and select Speaker, microphone, and camera. Select the Speaker, Microphone, or Camera drop-down list, and then select the speaker, microphone, or camera that you want to switch to.
Switch Your Speaker, Microphone, or Camera in a Cisco Webex Meeting or Cisco Webex Event
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If your computer has multiple speakers, microphones, or cameras and the one you're using isn’t working during a meeting, you can switch to a different one.