These notes are solar-powered and although the cells can't provide a lot of energy, these simple, low-res, e-ink displays don't need a ton of it. The screens are extremely barebones so far as electronic displays go; they can't do animations or much of anything beyond a few letters, but that's the beauty. They're just simple, one-use screens you can slap anywhere there is a little sun. Hopefully they find their way beyond the lab and into the marketplace sometime soon.
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