Have you ever used an Apple AirTag?

I just bought one last week. It is a cool little device about the diameter of a half-dollar coin, that can be put in your luggage or whatever, to keep track of where it is. You use your smartphone to monitor its location. I sent one to a friend of mine by mail, and I am tracking its progress as it is going through the postal system and traveling to him. Interesting technology.

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I sent that AirTag to a friend and he is hanging on to it for a week. I'm seeing where he is going on a day to day basis and it is cool to watch. He did get an alert on his iPhone saying that he was in the presence of an AirTag that was not registered to him. So I guess it has that feature to help limit people using them to track people without them knowing.
Have you ever used an Apple AirTag?
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