Koss ksc21 stereo clipon headphones enjoy high fidelity sound quality while remaining connected to the outside world with the koss ksc21 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 when you choose the ksc21 youre rewarded with the comfort of pivoting ear plates and the great crisp and clean sound of koss lightweight sportclip design stays put during sports and a