gregNow all three versions are open-source hardware certified by the Open Source Hardware Association.
Certifiable
A project log for Beeping, Blinking Business-card Badge (B4)
Second generation of the NFC business card adding audible feedback
A project log for Beeping, Blinking Business-card Badge (B4)
Second generation of the NFC business card adding audible feedback
Now all three versions are open-source hardware certified by the Open Source Hardware Association.
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