I just ripped some of these out of some old Tile keyrings!
Unsuccessfully soldered one so far 🙈it seems there's a coating on top that doesn't like being soldered onto (I used liquid flux, but the connection was still mechanically weak and easily breaks off of the thin coating).
I managed to solder to the + terminal of the Piezo after watching a video that shows you can in fact scratch the coating with a razor blade - it's still a very brittle connection, but I managed to solder to the correct pins to test it out and got beeps!
It was definitely louder, but there's no way i can solder the connections into the watch without something breaking (i already tried twice!)
It was a fail, but I learned some stuff too, so it's ok!
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