"Sennheiser HME 27 Professional Broadcast Headset - over-ear desin, closed back, automatically opening two-piece headband ( a wide headband padding is included that converts the two-piece headband into a compact single..."

Headsets Combination Closed, Circumaural, Impedance: 64 Ohms, Nominal sound pressure level: 108 ± 3 dB SPL / 1 V rms / 1 kHz, Transmission range: 60 -25000 Hz, Harmonic factor

Sennheiser HME 26-II-600 Professional Broadcast Headset - dynamic, closed back and on-ear headphone, impedance 600 ohms, sensitivity 107 dB SPL/1 kHz, 1V, frequency range 20 - 18000 Hz, microphone: typ BKE 4-2,...