The Ops-Core Near Field Magnetic Induction (NFMI) Earplugs provide increased noise reduction, while maintaining clear communications and 3D Hear-Through, when used with NFMI enabled Ops-Core headsets. Do not need batteries, recharging, or any wired connection. When engaged, the NFMI earplug will seamlessly integrate for clear communication. The kit ships with standard, slim, and large Comply foam tips, to accommodate a wide variety of users. NRR 30 dB, SNR 38 dB