What is this strange device?

Lying is such a thing at home for over a year as came to me, can anyone from Kent forgot, I do not know. But the joke is that as much as I see this thing, and I am suffering so much with the question of what it is.
Materyal - plastic.
There is an inscription - A4TECH.
On one side is self-adhesive film.
If anyone found out, tell us what kind of a stray.
ps. If everything is just, then please do not smeyatsyayu





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Photo 6 last.

and how it is used ????



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