[mrob]

>Actually all microphones can "speak".

Counterexample: https://en.wikipedia.org/wiki/Laser_microphone

[c22]

Countercounterexample: https://www.livescience.com/64619-laser-sound-beam.html

[mrob]

That's a laser specifically designed for transmitting sound, not a laser microphone.

[c22]

You know, I had that (extremely pedantic) thought as I was posting, but I figured someone might find it interesting anyway.