• Frequency Response: 40-20,000 Hz.
• Dynamic element for extended frequency response.
• Lightweight Sportclip design.
• Foam cushions for an open, hear-through sound.
• Straight, dual entry 1.2m cord and 3.5mm jack plug.

The Original Stereophone For some, music is a nice distraction. A thing to tap your toes to. For us, music isn’t a thing; it’s a place we go. We are the true believers. Koss has been bringing people closer to the music they love for more than 50 years. The first Stereophone (SP/3) in the world was created by John C. Koss and Martin Lange in 1958 and since then, Koss’ innovative products have gone from strength to strength with a range now including Full Size Stereophones, On-Ear Stereophones, In-Ear Stereophones, Ear-Clip Stereophones, Wireless Stereophones and Communication Headsets. Now, more than 50 years later….Koss’ creation has become a $2 billion industry, worldwide. Three principles serve as the foundation for the company’s success: The sound of Koss; focus on fit and breakthrough customer service. What do these principles mean? The sound of Koss: Musician, John C. Koss created “the sound of Koss” in 1958 and we have stayed true to it to this every day. The sound of Koss brings music back to life. Koss engineers are rigorous in their pursuit of the absolute best sound but it is the human listening experience that sets Koss apart. Focus on fit: We are obsessed with creating the absolute perfect fit – without it; we can’t get the perfect sound. We strive to create products that offer custom settings for every music lover. Our products couple to the ear – it’s just you and your music. Breakthrough customer service: Koss was the first to offer Limited Lifetime Warranty in 1989. Our domestic customer support staff is ready to help any listener with any issue. The Koss US factory and warehouse is based in Milwaukee Wisconsin – logistically, Koss has created an onsite inventory system that makes “out-of-stocks” virtually impossible. With that in mind, what do the KSC21 SportClip Stereophones have to offer you? Koss KSC21 SportClip Stereophones Enjoy high fidelity sound quality while remaining connected to the outside world with the Koss KSC21 sport clip headphones. These over-the-ear headphones deliver a wide-range, extended frequency response through soft foam ear cushions that guarantee an open, hear-through sound. The pivoting ear plates provide a better fit than most clips, so you can place them exactly for the perfect fit. KSC21’s are super light making them feel practically weightless, even after hours of high fidelity listening and the straight, dual entry 4 foot cord with 3.5mm plug allows you extensive freedom of movement to ensure that you can position the headphones for optimum listening. When not in use, simply tuck them into your briefcase, gym bag or pocket and carry them with you wherever you go. This is all backed up by the Koss Stereophones Limited Lifetime Warranty. When you choose the KSC21, you’re rewarded with only the best sound.