What is the small hole on the top of the pixel 3a?

Question

Many reviews note the pixel 3a has a headphone jack on top. Yes, I like it, too. But I can't find anywhere that describes the other little hole, the one on the right in this picture. What is it?

— dfrankow | Sources

Answer

If you look at the specs for the Pixel 3a and open up the Media & Audio section you'll see:

Stereo speakers

2 microphones

Noise suppression

The small holes are for microphones, usually multiple ones are used to improve call quality, i.e. suppressing background noise.

— Morrison Chang | Sources

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