Design: The ultra-slim, low-profile design fits comfortably around your ears and wont take up much space in your range bag. The Razor Slim Electronic Muff operates on two AAA batteries Long-Term Comfort: It features a noise reduction rating (NRR) of 23dB and Sound Activated Compression (SAC) of 0.02-second that protects your ears from loud gunfire, while still allowing you to hear range commands or communicate with shooting partners Bundle Includes: 2 x Walkers Razor Slim Electronic Muff (Carbon), 2 x Walker's Tactical/Hunting Walkie Talkie Integrates with Razor Muffs (2-Mile Range), 2 x Walker's Crosshair Sport Shooting Glasses (Clear), 2 x High-Quality Microfiber Cleaning Cloth