-
It would be the same way air tags do, they use the find my network, and any phone that connects with that will know if there's a device nearby. it's apples solution to stop people using air tags to hide on people or their personal property to find out where they live, where their stuff is stored etc.
I don't know whether non apple air tags still notify other people on the network or not. If they don't i might get one!
Does the Knog use the ‘find my’ network? If yes does it notify people that a tracker is following them?