Dear "TD2K",
"Metengr" have right, this is cost of warranty which must be added to the price of completly new product. In my country this product will appear for the first time. What I know ussualy for mechanical devices is from 1,5% up to 5% (or more) of a new product cost. But how to accurately calculate it ("PSE" gave me some idea - but maybe someone have also some solution).
Regards
Thank you in advance