This is a demo of a lighting control system controlled by a battery-less switch. The sensors in the switch are battery-less and activated by wireless energy transmitters.
[Demo] A Lighting Control System Using a Battery-less Switch Activated by Wireless Energy Transmitters
Prof. Sakaguchi spoke at IEICE Society Conference on mmWave Application in 5G and Beyond and Dr. Yu Tao spoke on A Lighting Control System Using Battery-less Wireless Human Detection Sensor
Please check out the link for details.