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Those switches look like they are the mini generators from ZF Electronics that produce 0.33 mWs of power per activation.

ZF Electronics used to be called Cherry Industrial, which was until a few years ago part of the same company as Cherry AG who make the famous keyboard switches.

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Yes, specifically ZF AFIG-0007 energy harvesting switch

https://dl.acm.org/doi/pdf/10.1145/3411839 p. 12

https://eu.mouser.com/ProductDetail/ZF/AFIG-0007

As a heads up, the second link leads to 404 Not Found error.

Edit: Oddly, the product page is viewable if you enter the product ID from the tail end of the URL into the product search field.

https://eu.mouser.com/ProductDetail/ZF/AFIG-0007?qs=KnNyCueL...

Whoa, I have to buy at least 5000 switches. Together with a price tag (~50K EUR) it does not look good for a weekend tinkerer.

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