This is a lot of 10 of Koss Stratus Stereophone, 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 Stratus combines the very best in sound performance without sacrificing comfort and portability. The Stratus 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 Stratus offers the listener great value at an opening price point.