It's an ESP32-C3 used in this

https://shop.lnbits.com/product/lnbits-tpos-thermal-receipt-printer

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Nice! Another project on my backlog 😁

Do you hook it up to an Android tablet / phone?

it watches an lnbits tpos extension and prints a receipt every time a payment is made.

I just checked the repo, definitely added to my list now. Thank!