Sennheiser HMD-300-XQ-2, 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 <0.1% at 1 kHz - 100 dB SPL, Nominal load capacity: 500 mW, Pressing force: 6.0 N ± 0.75 N, Dynamic microphone, Characteristic: Hypercardioid, Audio transmission range: 80 - 16000 Hz, Impedance: 300 Ohms, Output voltage: 0.4 mV / Pa at 1 kHz, Single-sided cable, Weight without cable: 319 g, Includes wind, pop protection and modular connection cable with XLR-3 plug and 6.3 mm jack