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by gtkspert 2292 days ago
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
1 comments
EvanAnderson 2291 days ago
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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