TL;DR: Logitech's Signature Slim Solar Plus K980 is a $99.99 solar-powered keyboard that charges using natural or artificial light, lasting up to 10 years with four months of use in darkness. It ...
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Logitech Signature Slim Solar+ K980 review: An efficient keyboard you’ll never need to plug in
This keyboard has the longest battery life, thanks to its solar panel.
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