Our all-new Recon Digital Electronic Muffs not only boast lightning-fast Sound Activated Compression (SAC) and a noise reduction rating (NRR) of 26 to ensure your hearing is always protected. They also deliver digital amplification technology that bolsters low-level environmental sounds so you hear what you should when you should. Low-profile, IPX4-rated muffs also feature an advanced digital audio circuit and full dynamic range HD speakers for clear, balanced sound.