philips hue buttons/switches power via the press of the buttons to transmit the commands to the hue base station. https://www.philips-hue.com/en-us/p/hue-tap-s

philips hue buttons/switches power via the press of the buttons to transmit the commands to the hue base station. https://www.philips-hue.com/en-us/p/hue-tap-switch/046677473365 https://www.philips-hue.com/en-us/p/hue-tap-switch/046677473... > The Hue Tap smart light switch is powered by kinetic energy, which means that when you press the light switch you generate sufficient energy ...