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Mute the microphone when not used.

You should mute your microphone, when not in use. This is not a 100% protection against espionage, but helps against normal accidental recording.

How to fix it

macOS 10.11 – 14

  1. Go to “System Preferences” > “Sound”
  2. Choose tab “Input”
  3. Choose your microphone device. Normally “Line In”
  4. Move the input volume slider totally to the left side.