Sennheiser HMD 27 headset; wired (cable not included!); over ear; closed back; dynamic; frequency range headphones: 4 Hz - 21 kHz; impedance: 64 ohms; sound pressure level: 102 dB SPL @1kHz, 1mW; integrated ActiveGuard Limiter (switchable: off, 95 dB, 110 dB); microphone (BMD 434): dynamic, hyper chardioid, 40 Hz - 18 kHz; impedance 300 ohms; weight (without cable): 240g