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EP3 Sonic Defenders protect your hearing without interfering with your ability to hear routine sounds or conversations. Their double-flanged-stem design fits most people and provides a Noise Reduction Rating (NRR) of 24dB. Sounds• at safe levels• are allowed to pass through into the ear canal• while potentially harmful noises (above 85dB) are reduced via a proprietary design that incorporates a special noise-reducing filter. EP3s include attached filter caps• which can be inserted for additional protection and blocking out lower-level noise• like that heard on a plane• where hearing ambient sounds or conversations isn't critical.