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The tiles do have that audible ding feature that's nice for keys, like stuck in the couch, for example.

AirTags also have an audible sound that can be played, I use this feature for when I lose my keys

Ah, thanks. I had assumed they didn't based since there weren't any visible holes for a speaker.

It's actually a really cool design, the entire white half of the shell _is_ the speaker diaphragm!