Listen To Your Ears. Your hearing health should never be ignored. SureFire EP4 Sonic Defender Plus will protect your hearing against Noise-Induced Hearing Loss (NIHL) without compromising your ability to hear routine sounds or conversations in noisy environments. Their triple-flanged-stem provides a Noise Reduction Rating (NRR) of 24 dB. Safe sound levels are allowed to pass through into the ear canal, while potentially harmful noises (above 85 dB) are reduced via our proprietary noise-reducing filter. EP4s include attached filter caps that can be inserted for additional protection, blocking out lower-level noise, like that heard on an airplane, where hearing ambient sounds or conversations isn't critical. Sonic Defenders are made from a soft, durable, hypoallergenic polymer that provides all-day comfort and extends product life (up to 6+ months, depending on usage and care).Features:Provides a 24-dB Noise Reduction Rating (NRR) with filter caps insertedLowers potentially dangerous noise levels above 85 dBPatented EarLock retention rings utilize seven contact points to lock earpieces in place and fit the same way every time; soft, double-flanged stems provide secure seals and all-day comfortMade from hypoallergenic, medical-grade polymer that's soft, durable, and long-lastingLow-profile design for superior comfort when worn with a mask, helmet or hat, or while using a phone, headphones or supplemental hearing muffsServe as earpieces for compatible radio communication systems*Each set is packaged in a convenient carry case and includes a polymer lanyardNote: EP4 earpiece will not provide hearing protection if the noise-reducing filter is removedRadio Comm System Compatibility: Thales Covert Security Harness; Harris Security Force Communication Set; Motorola Surveillance Kits; Tactical Command Industries Tactical Earpiece Products; Peltor Lightweight Systems-Hearplug; Silynx C4Ops Headset