DAVID CLARK COMPANY INC. > ENC HEADSETS > DC H20-10XPPRODUCTS > DAVID CLARK COMPANY INC. > ENC HEADSETS > DCCI H20-10XP DC ENC Headset - MODEL H20-10XP NSN 5965-01-447-6485 Special features: Electronic Noise Cancelling General Aviation Stereo NRR: N/A Impedance: Standard Earphone Type: Dynamic(ENC) Noise-Canceling Mic: M-7A Amplified Electret Earphone Impedance: Monaural, 150 Ohms nominal, stereo, 300 Ohms nominal per side Mic Impedance: 50 ohms +/- 20% Earphone Sensitivity: 90 dB SPL on flat plate coupler, re 1mW input @ 1KHz Mic Sensitivity: 400mV RMS ±6dB into 150 ohm load @ 1kHz for 114dB SPL input Earphone Frequency Response: 100-5,500 Hz Mic Freq Response: 300Hz--3.5KHz per RTCA DO 214 Earphone Plug: Mic Plug: Boom Type: Universal Flex Cord: 5 ft.Straight Headpad/Hardware: Patented Custom Comfort System Weight/Headset Only: 22 oz.