Samsung have a remote that will harvest power from radio waves and solar:
https://www.gizmodo.com.au/2022/01/samsungs-new-tv-remote-uses-your-routers-radio-waves-to-stay-charged/
i've been watching it to see if it's capable of keyword spotting, since it'd require some insanely low power processing to handle it
Insane power efficiency, page-25
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