Sennheiser HD 599 Headband Over-Ear Open Back Headphones Ivory 506831 Contents: Headsets, Cable, Manual, Box. New Opened Box Condition. Specs Impedance: 50 Ohms Frequency Response: 12 Hz to 38.5 KHz Sound Pressure Level: 106 dB (1 kHz / 1 Vrms) Total Harmonic Distortion (THD): <0.1% (1 kHz, 100 dB SPL) Cable Length: 9.8 (3 m) with 1/4 (6.3 mm) straight plug 3.9 (1.2 m) cable with 1/8 (3.5 mm) straight plug Features Exceptional Wearing Comfort Circumaural Design Replaceable Earpads 12 Hz to 38.5 KHz Includes a 9.8 Cable with 1/4 Plug