Airfix,
This is what babelfish online translated it to:
Original Walther P990 pistol converted on calibers of 4 mm M20 at a favorable complete price. To acquire with reliability in Germany of everyone starting from 18 years without need proof. Simplified acquisition on WBK without need proof (plant 2, section 2, subsection 3, point 1,1 and 1,2 weapon law). Only the reliability and special customer must be given.
Looks like its basically a airsoft type pistol. Walther has done similar 4mm plastic bullets with their PPK line when they first came out to help the user get familar with the controls of the PPK, without shooting real bullets.