Yes, you can turn off the microphone on the Echo Dot by pushing the microphone on/off button on the top of your device. When the microphone on/off button turns red, the microphone is off. The device will not respond to the wake word, nor respond to the action button, until you reactivate the microphone by pushing the microphone on/off button again. Even when the device's microphone is off, the Echo Dot will still respond to requests you make through your remote.
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