Noise Reduction Rating 24 Decibels Allows You to Turn Protection Off When Needed EPA Noise Reduction Rating: 24 Decibels closed, 4 Decibels open (when used as directed). The range of noise reduction ratings for existing Hearing protectors is approximately 0 to 30 (higher numbers denote greater effectiveness) PROTECHS™ Flip to Listen® Ear Plugs have a dual mode, allowing with a flip to easily switch from a closed to open position without the inconvenience of removing. These ear plugs are durable, reusable and can remain comfortably in place for hours. Information required by EPA: The level of noise entering a person's ear, when a hearing protector is worn as directed, is closely approximated by the difference between the A-weighted environmental noise level and the NRR.
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