The Original American Stereophone Company ,Ever since we invented the world's first SP/3 stereophone back in 1958, Koss Stereophones have been bringing back the excitement of a live performance. Music lovers around the world recognize that dedication to accuracy in sound reproduction as The Sound of Koss. ,Koss KTXPRO1 headphones provide lightweight, adjustable portability with great titanium sound. The adjustable headband on these active headphones guarantees a comfortable, secure fit as you listen at home, at work, or anywhere in between. , ,The Koss KTXPro1’s in-line volume control and open foam ear cushions deliver hear-through high fidelity sound, the truest convenience in portable music.