from apples site"What's the maximum distance one can track something?
Get by with a little help from hundreds of millions of friends.
When youʼve left something far behind, like at the beach or the gym, the Find My network — hundreds of millions of iPhone, iPad and Mac devices around the world — helps track down your AirTag. And it is designed to protect your privacy every step of the way.How does it 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 itʼs efficient, so thereʼs no need to worry about battery life or data usage.Lost Mode makes finding things even easier.
Just like your other Apple devices, AirTag can be put into Lost Mode. Then, when it’s detected by a device in the network, you’ll automatically get a notification. You can also set it so someone can get your contact info by tapping your AirTag with an NFC-capable smartphone — that’s the same technology that lets people pay for things with their phones.so basically the community with more Apple products the better, theres no distance it will let you know once other Apple products PING it and it will send you a notification. this is what makes it different than other tags out there (tile or Samsung). the product itself is nothing fancy or reinvention, the software and Apple's ecosystem is what makes this product insanely better than others out there