What is the cover on the laptop in the photo Acer Aspire E1-571G?

Question

Iron

Actually photo to the question:

Answer 1

There is nothing under the lid. Void with one sleeve for a screw. Development bug. These E1 acers also have this hatch, and the older aspire 5551 had it. Nothing is provided for these boards on motherboards, apparently they wanted to add another mPCI-e or mSata, but changed their minds

Answer 2

An "expansion card" is placed there, like a "triple moped" or a simple (telephone) modem.

Answer 3

There is a wifi module