Koss has been one of HeadRoom’s long-standing manufacturers, thanks to their impressive line of low-cost, high-quality headphones. The Koss Porta Pro have experienced small updates over the years but generally remain the same excellent pair of portable headphones they’ve always been. Perhaps best of all is Koss' excellent Lifetime Warranty on their headphones, proving they really do last the test of time! For almost 60 years, Koss has been making quality stereophones for personal use as well as for the recording industry. Today, the famous Sound of Koss can be found in the home, on the go, at your desktop or in the air. There is a quality Koss Stereophone for every personal listening need.