Massdrop Koss Porta Pro X Adjustable On-Ear Headphones, Black ———— Contents: Headphones, Carrying Case, cable, retail box. New opened Box Condition. ———— In the 1950s, when rock n roll was sweeping the nation but headphones were still largely reserved for communication purposes, Koss came along and changed everything by making the first stereo headphones designed specifically for personal music consumption. Since then, the company has continued to bring listeners closer to the music they love, and among their most popular releases was 1984s P