CBProjects

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Researcher has developed, at a cost of less than one dollar, a wireless light switch that runs without batteries, can be installed anywhere on a wall and could reduce the cost of wiring a house by ... in c/technology@lemmy.world
[–] CBProjects@lemmy.world 5 points 11 months ago (3 children)

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.