The high performance and comfort found only in David Clark Company headsets, at a very competitive price. The David Clark H10-36 Same as H10-30 but has 5′ coil cord with a single Helicopter (U-174/U) Plug. Certified Noise Reduction Rating (NRR): 24 dB. Super Soft Head Pad New Comfort gel, undercut ear seals Our “Best Value” Headset M-1/DC microphone, the best Amplified Dynamic microphone on the market Molded cord assembly made to exceptional pull and flex standards 5-year Warranty FAA TSO Approved C57 Cat. B and C58a Exceeds RTCA/DO-214 Standards Weight (without cord assembly): 20 oz.