David Clark Model H6740-M Behind the Head (BTH) Style
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Behind-the Head, dual ear style
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PTT button conveniently located on headset ear dome
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Quality components and rugged construction
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Rated Intrinsically Safe with FM Approval (Approved to IS / CSA / ATEX / IECex standards)
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Undercut, Comfort-Gel ear seals for maximum comfort
Noise Attenuation Data
NRR
23 dB Frequency (Hz) 125 250 500 1000 2000 3150 4000 6300 8000
Attenuation (dB) 14.1 21.9 29.4 32.0 29.7 35.2 36.2 38.1 37.4
Standard Deviation 2.5 2.5 3.0 2.7 2.2 1.7 2.5 2.9 2.8