The Surefire EP3 Sonic Defenders Ear Plugs protect your hearing without interfering with your ability to hear routine sounds or conversations. The double-flange-stem design will fit 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 the patented Hocks Noise Braker filter. The EP3 Ear Plugs include attached stopper plugs, which can be inserted for further protection and blocking out lower-level, constant noise, like planes or heavy machinery, where hearing ambient sounds or conversations is not critical. The right/left color-coded Sonic Defenders are made from a soft but durable, hypoallergenic polymer and are ergonomically shaped, with an adjustable-stem design, providing a secure fit, all-day comfort, and extended product life. The EP3's low-profile design means they can be worn while wearing a helmet or mask, or while using a phone or headset. The EP3 Sonic Defenders can also serve as earpieces for EarPro by SureFire and other compatible radio communication systems simply by removing the Hocks Noise Braker filter and attaching the earpiece to the system. The EP3 earpiece will not provide hearing protection if the Hocks Noise Braker filter is removed. The EP3 is compatible with 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. Technical Information: 24dB Noise Reduction Rating (NRR) with stoppers inserted Lowers potentially dangerous noise levels above 85dB Hear safe sound levels (with stoppers out) as if you weren't wearing ear plugs EarLock by SureFire retention ring utilizes seven contact points to lock earpiece in place and fit the same way every time; soft, double-flan...