Ali-Express Remote Power Switch

An interesting find at Ali-Express: a wall switch that can turn on a lamp in a room which was not wired for one originally. https://www.aliexpress.com/item/1005008624426312.html The "remote" is packaged like a light switch...but inside is a RF module and battery. The power-module (on the left) can be wired into a lamp or even a wall socket I imagine. Kind of handy! Taking the cover off the…