The Walkers Razor Slim Electronic Muff features advanced sound-activated compression technology, effectively reducing harmful noises like gunshots and loud machinery to safe levels, while still allowing you to hear important ambient sounds. With a noise reduction rating (NRR) of 23 dB, these earmuffs provide exceptional protection in even the loudest environments, ensuring your hearing stays safeguarded. Walker's GWPRSEMSPRNKBL Razor Slim Electronic Muff 23 dB Blue Sprinkles