My Xiaomi doorbell button works the same way.
CBProjects@lemmy.world 11 months ago
I saw a similar device in a friends new build 3-4 years ago. It used the energy from you pressing the switch to transmit to the fitting.
evident5051@lemm.ee [bot] 11 months ago
LastYearsPumpkin@feddit.ch 11 months ago
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…