The Razor Slim XTRM series features a cooling headband, a Noise Reduction Rating (NRR) of 21 dB, and utilized sound activated compression (SAC) of 0.02 seconds. SAC is a special electronic circuitry that will compress gun shots and other loud noises down to a safe level, without completely shutting the noise off. This allows you to hear range commands or communicate with your hunting partners, even when shots are being fired around you. Your hearing cannot be replaced, so make sure you pick up a set of Walkers Razor Electronic Earmuffs for your next trip to the woods or range. Includes 2 AAA batteries. DYNAMIC PROTECTION Protect your hearing with these hunting earmuffs, featuring advanced noise reduction technology & frequency tuning for natural sound clarity; Encased in a sound-dampening composite housing, they feature recessed volume control knobs SOUND-ACTIVATED COMPRESSION Boasting a 0.02-second sound-activated compression, these outdoor hunting muffs swiftly compress loud noises to safe levels; This enables clear communication, ensuring situational awareness in any shooting environment COMFORT REDEFINED The mesh moisture-wicking headband ensures optimal cooling; With comfort gel earpads & a durable rubberized coating, these hunting earmuffs offer a snug fit that enhances your situational awareness without compromising on comfort THOUGHTFUL DESIGN These hunting earmuffs feature an ultra low-profile design & a foldable construction; With an audio input jack and a comfort headband, these hunting earmuffs offer added versatility & convenience; Powered by 2 AAA Batteries (Included)