The Koss UR10C Stereophone The Koss UR10C comes equipped with a UR10 stereophones and a BONUS pack of earbuds! The Koss UR10 Stereophone is a new portable model that offers maximum sound quality and comfort in a lightweight, portable design. Today’s music lovers depend on lightweight, portable stereophones to reproduce their favorite recording on the go. The UR10 combines the very best in sound performance without sacrificing comfort and portability. The UR10 is a portable stereophone that delivers deep bass. With a frequency response, of 60-20,000 Hz, it features an adjustable headband that provides a secure fit for active music listening. The closed, leatherette ear cushions provides maximum isolation and comfort. The UR10 offers the listener great value at an opening price point. The UR10C by Koss is covered by Koss' No*Questions*Asked Lifetime Warranty.