Behind-the-Head Style (BTH)
- Noise-Cancelling M-7A amplified electret microphone
- Microphone on/off button
- 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
- 6 ft. coil cord
- Noise Reduction Rating (NRR): 23 dB
NRR | NOISE ATTENUATION DATA - MODEL H3442 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 3150 | 4000 | 6300 | 8000 | |
| Attenuation (dB) | 14 | 21.1 | 31 | 37.1 | 33 | 35.6 | 35.6 | 38 | 36.5 | |
| Standard Deviation | 2.7 | 2.7 | 2.8 | 2.7 | 3.3 | 3.5 | 3.2 | 2.9 | 3.4 | |
