The Pro4AAAT follows in a long line of Koss stereo-phones 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 stereo-phone incorporates an extra-wide, adjustable steel and rubber headband design that further ensures comfort during long listening and recording sessions. The ear-cups 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.