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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 michaelt on Wednesday February 20, 2019 @06:50AM (#19207185) 

  If you design in something which is later
  not used, you don't populate that part of
  the circuit board.
In this case the microphone was discovered when Google added built-in 'Google Assistant' support to the 'Nest Guard'.

I think there is no doubt they intended to start using it later, because they did.

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