The 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 hearing is always protected. They also deliver digital amplification technology that bolsters low-level environmental sounds. Low-profile, IPX4-rated muffs also feature an advanced digital audio circuit and full dynamic range HD speakers for clear, balanced sound. Walker's GWPRECM Recon Digital Muff Over the Head 26 dB Black.