There are switches that use the kinetic energy of the button push to work. No batteries, no wires. https://www.enocean.com/en/products/enocean_modules_24ghz/ h

There are switches that use the kinetic energy of the button push to work. No batteries, no wires. https://www.enocean.com/en/products/enocean_modules_24ghz/ https://www.enocean.com/en/products/enocean_modules_24ghz/