From Habr. Electronic identity cards in China.
When I take a child out of the kindergarten, I just have to attach it to the reader at the entrance – and it will show me who his parents are.

22sobaki: I also didn’t understand about kindergarten – what to attach and what the terminal in response should show.

Heathen: Well, you remember, it’s China, there’s everything on one face, even children. So here, you come for your own in the kindergarten, you need to recognize it somehow. You attach the child to the reader and see whether it is yours or not yours. It is clear that it is not necessary to apply all - by clothes, at least approximately can be known. However, it is still necessary to make sure.