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A comment on Google says Nest’s built-in mic not listed in specs was not meant to be secret. Parent comment

Re:Google says Nest’s built-in mic not listed in specs was n... by randcraw on Wednesday February 20, 2019 @11:00AM (#19208911)
Yes, any speaker can become a mic, but only if you plug it into an amp's input channel. Unfortunately for the CIA, they're all plugged into output channels.
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Re:Google says Nest’s built-in mic not listed in specs was n... by throw082 on Wednesday February 20, 2019 @12:04PM (#19209538)
input and output channels are not always physically different pins, sometimes it's just a software configuration. see https://news.ycombinator.com/item?id=13014435
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