this post was submitted on 05 Dec 2023
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Back in 1956, the Zenith TV remotes didn't require a battery and just used the power generated by pushing the button. They were severely limited in the number of buttons available though, due to the technology of the time.
https://www.theverge.com/23810061/zenith-space-command-remote-control-button-of-the-month
Those worked by sound. No power was needed or generated by the remote.
From the article...
I THINK I even remember, way back, random channel changes from tapping on a drinking glass or something similar... Cool tech for the time