Highest decibel protection. Trusted since 1992. Over 200 million pairs sold. (hashtag)Hearos. Plug in. Visit hearos.com. Instagram. Facebook. Twitter. Tested according to ANSI Specs S3.19-1974. The level of noise entering a person's ears, when hearing protector is worn as directed, is closely approximated by the difference between the A-weighted environmental noise level and the NRR.