EP4 Sonic Defenders® Plus protect your hearing without interfering with your ability to hear routine sounds or conversations. Sounds, at safe levels, are allowed to pass through into the ear canal, while potentially harmful noises (above 85dB) are reduced to safe levels via a proprietary design that incorporates a special noise-reducing filter. EP4s 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. The right/left color-coded Sonic Defenders Plus 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 (up to 6+ months, depending on usage and care). Comfortable EP4 Sonic Defenders Plus also serve as earpieces for compatible radio communication systems simply by removing the noise-reducing filter and attaching the earpiece to the system. NOTE: EP4 earpiece no longer provides hearing protection once the noise-reducing filter has been removed. Size “medium” EP4s fits most people. For those with smaller (in diameter) ear canals, the two-flange stem of our EP3 Sonic Defenders may provide a better fit than the EP4’s three-flange stem. Each set is packaged in a convenient carry case and includes a polymer lanyard. Bulk – 25 Pairs. Lowers potentially dangerous noise levels above 85dB. Hear safe sound levels (with filter caps out) as if you weren’t wearing ear plugs. EarLockT by SureFireT retention ring utilizes seven contact points to lock earpiece in place and fit the same way every time; soft, double-flange stem provides secure seal and all-day comfort.