Inexpensive Bluetooth earphones.
Two earpieces connected with cable, buttons only on the right one.
Earphone turned out to be easy to disassemble.
Components on the PCB are covered with rubbery coating - this should be partially water resistant.
Left piece contains probably only LiIon cell (and obviously acoustic transducer).
Date on the PCB: 2018-11-14.
CSR8635 from Qualcomm.
Single microphone.
Unfortunately this is failure of acoustic transducer itself and from my experience they are pretty much irreparable. I might try to find matching replacement later though - it looks like there earphones can be reassembled without significant damage.
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