Highest Noise Reduction Rating (NRR) for noisy helicopters. Super Soft Head Pad New Comfort gel, undercut ear seals Hinged wire boom with the M-101 amplified Dynamic microphone Conforms to MIL-M-27291A Coil Cord (5′ extended) with U-174/U Plug 5-year Guarantee FAA TSO Approved C57 Cat. B and C58a Exceeds RTCA/DO-214 Standards Weight (without cord assembly): 20 oz. Noise Reduction: 27 dBWeight: 20 oz.Warranty: 5 yearsMade in: U.S.A.