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>Actually all microphones can "speak". Counterexample: https://en.wikipedia.org/wiki/Laser_microphone https://en.wikipedia.org/wiki/Laser_microphone

• c22 6y ago
  Countercounterexample: https://www.livescience.com/64619-laser-sound-beam.html https://www.livescience.com/64619-laser-sound-beam.html
  • mrob 6y ago
    That's a laser specifically designed for transmitting sound, not a laser microphone.
    • c22 6y ago
      You know, I had that (extremely pedantic) thought as I was posting, but I figured someone might find it interesting anyway.