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A comment on 4.2″ and 7.5″ NFC-powered e-Paper Displays Work without Battery. Parent comment

Re:4.2″ and 7.5″ NFC-powered e-Paper Displays Work without B... by gtkspert on Tuesday March 17, 2020 @05:24PM (#22610613)
Actually, there are units similar to this that update over Infrared (even non-directionally)

Best Buy use them as price tags: https://www.youtube.com/watch?v=7aVoeDC-7MA

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Re:4.2″ and 7.5″ NFC-powered e-Paper Displays Work without B... by EvanAnderson on Tuesday March 17, 2020 @09:15PM (#22612608)
Similar insofar as using e-ink, but they're battery operated (from what I can tell). The "coolness" of what I'm talking about would come from being a completely passively-powered device.
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