The KOSS Stratus Stereophone is a 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. It delivers deep bass and has a frequency response of 60 Hz through 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.