Walker's Game Ear Power Electric Muffs with AFT Power - 50 dB / Adjustable Frequency Tuning (AFT) / Ultra-light weight Sound Activated Compression (SAC) : Circuit reduces loud sounds, like muzzleblasts, to safe levels Noise Reduction Rating (NRR):24 dB Two independent volume controls allow for true stereo sound while wind-resistant high frequency microphones make it easy to identify sound and direction Anti-bacterial butyl ear pads- uses an anti-microbial agent that helps prevent bacterial growth, mold and fungi