Noise Reduction: Passive NRR: 24 dB Impedance: Low NSN: 5965-01-390-9240 Earphone: H-143/AIC (Dynamic) Microphone: M-87/AIC (Dynamic) Earphone Impedance: 19 ohms each wired in parallel Mic Impedance: 5 Ohms +/- %20 Earphone Sensitivity: 102dB min. @ 1mW rms input at 1kHz Mic Sensativity: 34.0dB – 40.98dB (above...