Sleep Pretty® In Pink Ear Plugs. NRR 32. Quiets snoring for restful sleep. By hearos®. Noise reduction rating 32 decibels (when used as directed). The range of noise reduction ratings for existing hearing protectors is approximately 0 to 30 (higher numbers denote greater effectiveness). 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 S3.19-1974): Frequency 125 ... 250 ... 500 ... 1000 ... 2000 ... 3150 ... 4000 ... 6300 ... 8000. Mean Attenuation (dB) 36.1 ... 37.4 ... 39.7 ... 38.6 ... 38.5 ... 44.6 ... 45.4 ... 47.4 ... 48. Standard Deviation (dB) 3.6 ... 4.9 ... 4.3 ... 3.1 ... 2.7 ... 3.2 ... 4.1 ... 3.2 ... 3.2. Example: 1. The environmental noise level as measured at the ear is 92 decibels dB(A). 2. The NRR is 32 decibels (dB). 3. The level of the noise entering the ear is approximately 60 dB(A). Assembled with USA components. Hearos, Sleep Pretty In Pink and the color pink in ear plugs are registered trademarks of Bumble BE Holdings, LLC. Visit: www.hearos.com. Copyright ©2016.