VIMAR 0K03906.08 Arké Round Friends of Hue Smart Switch Kit, Wireless Light Switch without Battery, Dimmer Switch Kit contains Double Cover Plate, Mounting Frame, Switch And 2 Buttons

Instructions and Tutorials on VIMAR website

No batteries needed, with total respect for the environment. The power supply is self-generated on pressing the push button, which activates the internal electro-dynamic generator requiring a stronger pressure than the standard push buttons including a louder click sound. This small fraction of energy is enough to transfer the radio frequency wave to the gateway, that need to be placed nearby, to assure a functional radio link (one pressure, one command)

You can also use it in wireless mode, by placing it on any surface whatsoever; no masonry work is required, making it ideal for renovations

1-Way switch with dimmer function for the precise control of lamps or to retrieve light scenarios configured by the Philips Hue app

Wireless 1-way switch KIT, controls the light scenarios of friends of Hue light bulbs, using the Philips bridge