Description Model H3440 Behind-the-Head Style (BTH) Noise-Cancelling M-7A amplified electret microphone BTH style for applications requiring hard hats or protective headgear Flex-wire boom for easy, 'one touch' microphone placement Boom rotates 200° for left or right placement Contoured, undercut 'Comfort-Gel' ear seals for maximum comfort Rugged construction 36" straight cord Noise Reduction Rating (NRR): 23 dB Part Number: 40583G-01
