Sennheiser HD400s Headphones

Impedance: 18 Ω
Frequency response: (Microphone): 100 – 10,000 Hz (-10 dB)
Frequency response: (Headphones): 18–20,000 Hz (-10 dB)
Sound pressure level (SPL): 120dB (1kHz/1Vrms)
THD, total harmonic distortion: <0.5% (1kHz/100dB)
Ear coupling: Over-Ear
Jack plug: 3.5mm angled
Cable length: 1.4m
Transducer principle: Dynamic
Weight: 217g
Pick-up pattern: Omni directional
Microphone sensitivity: -44dbV/Pa
Acoustics: Closed
Sensitivity:120 dB SPL @ 1 kHz, 1V RMS