Hearos Sleep Pretty Tonight Ear Plugs - 2.0 pr
$1.25
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Description
High NRR 33. Helps block snoring. Over 500 million Ear Plugs sold. 28 years of protecting ears. Tested according to ANSI Specs S3.19-1974. The level of noise entering a person's ear, when hearing protector is worn as directed, is closely approximated by the difference between the A-weighted environmental noise level and the NRR. Attenuation Chart (ANSI 3.19 - 1974): Frequency: 125; Mean Attenuation (dB): 39.9; Standard Deviation (db): 4.9. Frequency: 250; Mean Attenuation (dB): 37.7; Standard
