EnOcean push-buttons
The EnOcean technology is an energy harvesting wireless technology used primarily in building automation systems. Modules based on EnOcean technology combine micro energy converters with ultra low power electronics, and enable wireless communications between batteryless wireless sensors, switches, controllers and gateways.
Following example show how to toggle light and / or scene with EnOcean wireless batteries-less push-button.
HW:
SW: