Respect for all those who need a "proper" calculation! The bills are written in "China". A turnover tax does not exist. Currently I'm using the Amazon support in contact to find a solution to this problem.
To the article: The chosen product fits well, is working properly, the "corner clip" on the corner where the volume can be adjusted, could be something stabieler. But however, is not a limitation. The shell is keeping super on iPad Air2.