I found some on/off switches on Amazon that appears to use the motion of your hand pressing the switch to generate the power to transmit. It makes a fairly loud

I found some on/off switches on Amazon that appears to use the motion of your hand pressing the switch to generate the power to transmit. It makes a fairly loud CLICK when you press it, so I assume it's some sort of piezoelectric mechanism? It is basically this (different brand but identical housing): https://www.amazon.com/Self-Powered-Wireless-Receiver-Linptech-Control/dp/B09MHL8QTC/ https://www.amazon.com/Self-Powered-Wireless-Receiver-Linpte...