The New Pro4AAAT follows in a long line of Koss stereophones designed for the broadcast professional. The latest titanium version features a Sound of Koss that every discriminating listener is sure to enjoy. The PRO4AAAT features titanium coating on 2 mil mylar diaphragms for a frequency response of 10-25,000 Hz. Oxygen-free copper voice coils improve signal transmission and conduction for accurate sound. Computer optimized ferrite magnet structures provide deep bass and treble clarity. Closed, vinyl Pneumalite™ ear cushions seal tightly around the ear for improved isolation and maximum bass. Designed for ultimate durability for home or everyday studio use, the PRO4AAAT stereophone incorporates an extra-wide, adjustable steel and rubber headband design that further ensures comfort during long listening and recording sessions. The earcups also fold flat for convenient travel and storage. The PRO4AAAT comes with a sleek case for protective portability. ThePro4AAAT comes equipped with a coiled, single entry eight-foot cord, and 3.5mm plug with 6.3mm adapter included.