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http://design.fr/product-design/cheers-to-finger-p
It's one of those things that make you think, why didn't I think of that. 
Beta Tester 
Very nice idea, need to see if it actually works first, and also don't forget that the space used for your finger and generator could be used to store more of the actual material that stores energy. Lithium-ion batteries are popular partly because they can form any shape or size so can be fit into a wide variety of shapes and equipment sizes.
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