Dynamic Element for extended frequency response Closed leatherette ear cushion for maximum isolation and deep bass Built for maximum durability for DJ and recording use Straight, single entry 8 foot cord Built to last, the UR20 is covered under Koss? Limited Lifetime Warranty - the only warranty of its kind in the stereophone industry. Specifications Frequency Response : 30-20,000 Hz Impedance : 32 Ohms Sensitivity : 97dB SPL Distortion : <0.3% Total Cord : Straight, Single Entry, 8ft