Sennheiser HD 400S, Headphones, Dynamic, Closed, Circumaural, Foldable, Maximum sound pressure level (1 kHz / 1V RMS): 120 dB, Impedance: 18 Ohm, Frequency range: 18 - 20000 Hz, Distortion factor (1 kHz): <0.5, Cable with 1-button remote control and microphone, 1.4 m Cable with 3.5 mm angled jack plug on one end, Weight: 217 g