Do-All Outdoors - Sound Soldier Quad Muff W/AFT Kryptek Highlander CONSTRUCTED FOR COMFORT AND PERFORMANCE: made with high quality plastic and Butyl rubber ear pads to maximize comfort and performance FOUR OMNI DIRECTIONAL, WIND RESISTANT, HIGH FREQUENCY MICROPHONES: to enhance hearing up to 9 times LONG LIFE: approximately 200 hours of battery life INDEPENDENT VOLUME CONTROLS WITH AFT: allows user to fine tune set to individual hearing preferences SOUND ACTIVATED COMPRESSION: protects user from harmful effects of the muzzle blast for sounds above 85dB, providing the best hearing enhancement and protection available