Like your camera, there are a few common reasons why microphones don't work.

• It's not plugged in or turned on
• The batteries are not charged
  • Put it on the charging stand. If you need new batteries, or your stand isn't working, we will provide you with replacements. 
• There is another microphone somewhere that is plugged in (rare)
  • Occasionally there could be an audio input device that was left inside a teacher's cart or is integrated with an existing webcam. This can be solved by removing this device and restarting your PC.

TOO LOUD/QUIET OR CREATING FEEDBACK

If your mic is too loud, or producing static feedback, you can lower the output volume on either the microphone or on the switcher. 

Conversely, a quiet microphone can be remedied by raising the volume, however this can make it produce feedback, so it is up to your discretion what sound level is appropriate.