Before revision: Example of trackers that work this way are Chipolo, ON!Track (by Hilti), Airtag by Apple, Tick (by Milwaukee Electric Tool Corporation), Tile, TrackTag (by Bosch), TrackR and PROTAG.
After revision: Example of trackers that work this way are Chipolo, ON!Track (by Hilti), AirTag by Apple, Tick (by Milwaukee Electric Tool Corporation), Tile, TrackTag (by Bosch), TrackR and PROTAG.