New ProEars TacSlim Gold Military Grade Hearing Protection and NRR28 EarMuffsThe Pro Tac Slim is for professional shooters range officers and NRA instructors. NRR of 28. The exclusive DLSC Technology has the fastest response time in the industry - 1.5 milliseconds. Military grade dual circuit boards. No wires to break or get snagged. Indoor or outdoor-handguns or long guns. Maximum adjustability. Five year warranty. . Feature : Military grade dual circuit boards. Gold Connectors for high quality audiophile sound. Automatic shut off after 4 hours Pro Form Leather ultra-comfortable ears seals and padded adjustable headband. Amplifies sound more than 8x normal hearing.