Sennheiser HMD 46 intercom headset; wired (cable not included!); on ear; open back; dynamic; frequency range headphones: 16 Hz - 20 kHz; impedance: 200 ohms; sound pressure level: 100 dB SPL @1kHz, 1mW; integrated ActiveGuard Limiter; microphone (BMD 434-46): dynamic, hyper chardioid, 40 Hz - 18 kHz; impedance 300 ohms; weight (without cable): 150g