KOSS, KOSS and Design, PORTA PRO, THE SOUND OF KOSS and HEARING IS BELIEVING are Registered in U.S. Patent and Trademark Office and are trademarks of Koss Corporation in other countries.
KOSS, KOSS and Design, PORTA PRO, THE SOUND OF KOSS and HEARING IS BELIEVING are Registered in U.S. Patent and Trademark Office and are trademarks of Koss Corporation in other countries.Koss Corporation is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. The Koss Amazon "Pick Your Deal" promotion runs May 15th, 2020 12:01am CDT through May 31st, 2020 11:59pm CDT. Promotion only valid at Amazon.com on Porta Pro® Black, IL100w, IL100k and IL200w KTC. Amazon.com has separate terms and conditions. See Amazon.com's terms and conditions for more information. Supplies are limited. Terms are subject to change.