I guess electronic passports, also called ePassports, are coming soon to us. Not far away in the future you cannot leave your house without having a gadget. Some people would also call it an electronic tagging device or an electronic handcuff.
![Electronic passports in preparation](https://i0.wp.com/192.168.178.127/wp-content/uploads/2021/04/pass-2260989_1920-1024x768.jpg?resize=580%2C435)
Another use case is, of course, a digital vaccine passport.
https://www.engadget.com/google-android-ready-se-alliance-204241463.html