How does an Air Tag work through WiFi?

How does AirTag work?

Your AirTag sends out a secure Bluetooth signal that can be detected by nearby devices in the Find My network. These devices send the location of your AirTag to iCloud — then you can go to the Find My app and see it on a map. The whole process is anonymous and encrypted to protect your privacy. And is efficient, so there is no need to worry about battery life or data usage.