Sennheiser HMDC 27, Professional Broadcast Headset, Circumaural, Closed back design, Noise compensation (Noise-, Gard): the NoiseGard electronics reduce noise by an additional 15 dB in addition to the passive attenuation of the closed design, No batteries required: power supply via microphone bias voltage from the commentator unit (P12-P48 according to DIN_EN 61938), Two-part split headband (for conventional wearing comfort, a wide head pad is additionally included to hold the headband together), One-sided listening is possible due to swivelling earpiece side, Swivelling microphone can be worn on right or left side, ActiveGard limiter can be activated and protects against sudden level peaks > 110 dB, Impedance: 600/200 Ohm (ANR on/off), Max. sound pressure level: 128 dB SPL at 1 kHz, Frequency response: 8 - 18000 Hz, Microphone: Type BMD 434 (hypercardioid, impedance: 300 Ohm, audio frequency range: 40 - 18000 Hz), Field transmission factor 0.5 mV/Pa @ 1 kHz, Weight: 240 g, Includes Cable II-X3K1, wind and pop protection and cable clamp @+*Note:* Cables from the 26-II Series are compatible with this headset.@+@+@+Suitable cables available under:@+@+, Article Nr #251432#, Article Nr #448025#, Article Nr #448028#