As I do not understand rusian, i can’t read what your link does say, but as the designer of it, I must say it’s a spanish invention, and altough it does look a bit awkward, it feels comfortable in your palm.
Right and left switches are activated like an apple mouse, by pushing down the corners about 1mm down.
The slider plastic under both buttons does indeed have some nylon plastic to make it useable and of course, it’s a wireless mouse powered by two AAA batteries.

(first apearance was in “Arnies airsoft forums” and second apearance was in Metkumods, as for backtracking purposes ^^, under the name Inventor)