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.
theverge.com/…/zenith-space-command-remote-contro…
henchman2019@lemmy.world 11 months ago
Those worked by sound. No power was needed or generated by the remote.
From the article…