Hi
I need your help guys,I hope you will know to tell me where can I find a serial number on Koss porta pro which I need for registering the product on koss.com .I already wrote to koss customer service but no answer, and I have really good experience with getting quick and good informatio from forumpeople so I hope that's right way
I really can find out where should the number be,if on the headphones or box...Thanks