What are these for flaps on the bottom of the laptop?

I would be interested in what kind of flaps / card below on Lenovo-Laptoos. I've seen these Karzen on several Lenovo laptops. Are they good for anything? The cards can't be pulled out completely, only as far as in the picture.

I hope you can help me.

Thank you in advance 😀😁

Can you show that in more detail, and from the beginning?

I added the pictures to the question, does that fit?

Apparently you can read information or properties of the computer, that is, only for information

Were they not for Surface to expand the memory with better mod dents?

The way it looks, it's not working flaps:-)

Information cards. Otherwise you have to print it on the BackCover, and nobody wants that.