It’s the same in the UK - indoor public spaces have been smoke free since 2007. This is proposing removing public outdoor smoking spaces at bars and restaurants.

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.

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She knows how to look under and behind things

https://play.acast.com/s/blindboy/patgracesfamousfriedchicken

My favourite history. Pat Grace’s Famous Fried Chicken: https://open.spotify.com/episode/0uFbJFPRxd7Or4EiJ1V0jy

Afraid not, but it’ll be well beyond audio frequencies, likely 1Msps+

It is a beast! I used it to make a 16 voice polyphonic subtractive synth.