Walker’s Razor Slim Electronic Earmuff Features. Ultra low-profile, light weight, slim design with rubberized ear cups. Full Dynamic Range HD speakers amplify safe ambient noise. Two omnidirectional microphones for clear sound enhancement. Folds up for easy transport and storage. NRR 23 protection from noise. Walker’s Razor Slim Electronic Earmuffs. The Razor Slim from industry leader Walker’s Game Ear offers all the features you need and expect in a slim, low-profile package. The speakers are low noise/frequency tuned to ensure you get natural sound clarity, keeping you aware of your surroundings at all times. (With the built-in audio input jack, you can optionally enjoy your favorite music in clear hi-def sound). Sound Activated Compression (SAC) responds to gun blast noise within a 0.02 second attack time, shutting off the ambient amplification and providing the full rated NRR 23 protection from noise. Rubberized ear cups lend these earmuffs a rugged style, and the wire frame headband is cushioned for comfort. Hunters and shooters are demanding when it comes to hearing protection (rightfully so), and Walker’s Razor Slim delivers every point on target — all in a lightweight, compact, ultra low-profile package.