Hello, bought these on Taobao. As seller says, these come from scrapped Bang and Olufsen portable audio products, but due to copyright (LOL) reasons, he can't tell me the models. I've watched several youtube videos for B & O Bluetooth speaker disassembly, and these definitely are B & O - Very similar mechanical design and marking style, but no exact match. Maybe someone can ID them? They are approximately 2.5 and 2.75 inch diameter, smaller one being marked as RADMERSPWM908402NA, and bigger one as LIDMERSPWE8164009S. The QR code on them contains that marking, nothing else.
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The bigger one looks very similar for these. But seller say they're Beolab 15, when in real life, Beolab 15 is completely different speaker.
b&o beolab 15 wall mount speakers Subwoofer Bang and & Olufsen | eBay
b&o beolab 15 wall mount speakers Subwoofer Bang and & Olufsen | eBay
Well if anyone cares, bigger one was identified, and it is bass speaker from Harman/Kardon Allure smart speaker.