Walker?s Razor hearing protection is a high-performance electronic earmuff that is designed to provide superior hearing protection while maintaining clear, natural sound. The earmuffs feature a Tacti-Grip headband that ensures a secure, slip-free fit, even in the most demanding conditions. The full dynamic range HD speakers deliver clear, balanced sound, so you can still hear important environmental sounds like traffic or wildlife. The Razor also features sound activated compression (SAC) technology, which automatically reduces loud noises to a safe level without muffling speech or other important sounds.