Sennheiser HD 569, Over-Ear Headphones, Circumaural, Closed, Cable attached on one side, Max. SPL: 115 dB SPL @ 1 kHz, 1 V RMS, Impedance: 23 Ohm, Frequency range: 10 - 28000 Hz, Total harmonic distortion at 1 kHz < 0.2%, 3 m Cable with 6.3 mm jack, 1.2 m cable with 1-button remote control and straight 3.5 mm jack plug