You searched for "batteryless"
Telemecanique Sensors
Telemecanique Sensors OsiSense XC Series Receiver for Use with OsiSense XCKW Wireless & Batteryless Limit Switches,
Part: XZBWR2STT24
A wireless receiver that picks up signals from batteryless limit switches to monitor equipment position and control machinery without running cables.
Schneider Electric
Emergency Light Test Switch for use with Wireless and Batteryless Switch
Part: S520192K
A wireless test switch for emergency lights that doesn't need batteries, used to check that emergency lighting systems work properly.
Telemecanique Sensors
Telemecanique Sensors OsiSense XC Series Transmitter for Use with Multi-Sensors, OsiSense XCKW Wireless & Batteryless
Part: XZBWE112A24
A wireless transmitter that works with Telemecanique limit switches to detect position and movement without needing batteries or external power.