The Impact Sport Bolt Digital Electronic Earmuff's lightning-fast .5 millisecond attack time protects you from hazardous noise without leaving you in silence. For important passive hearing protection, patented Air Flow Control Technology delivers a Noise Reduction Ration of 22. Engineered exclusively for shooting and hunting, the Impact Sport Bolt design features low-profile earcups for optimal gunstock fit, directional microphones for optimal tracking of prey, and an in-line microphone to stay connected with other shooters or hunters. Mfg: Howard Leight