How do I turn off the listening microphone on my watch
How do I turn off the listening microphone on my watch
Apple Watch Series 4, watchOS 6
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It is off unless you are running an app that uses it.
if it is on you will see the microphone icon
With watchOS 7, the microphone icon 
means your Apple Watch mic is listening. It appears when you're talking to
Siri, recording a voice memo, or using any app that activates the
microphone, such as Handwashing or Walkie-Talkie.