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https://digipres.club/system/media_attachments/files/109/474/203/404/848/252/original/06df72481bec4534.png
main chip and antenna on the upper left, a small chip + some passives for each letter, and a button in the top-right.
It calls itself an SP-0042 Sensor PCBA, revision 12P5, from 2017.
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