Champion Vanquish Electronic Hearing Protection was designed from the ground up for the shooting sports. Each muff was acoustically modeled on gunshot reports to achieve the optimal balance of all day comfort and noise reduction. They feature Safe Level Sound Compression Technology with a refresh time less than 1 ms. Two Full Dynamic Range HD speakers ensure everything you hear is crystal clear. Omnidirectional microphones pick up everything around you, giving a natural sound while minimizing wind noises. Features: Safe level sound compression technology Acoustic foam for all day comfort Sound refresh time less than 1 ms 2 full dynamic range high definition speakers (2) omni-directional microphones 3x amplification 200 hr runtime 3 hr automatic shut off