microphones and includes audio input jack and recessed volume control knobs. DESIGN: Composite housing gives you more effective sound dampening; Independent volume controls give you greater control over the sound. NOISE REDUCTION: Boasts a noise reduction rating of 23 dB with 2 omni directional. BALANCED SOUND: Features full dynamic range HD speakers for clear balanced sound with sound activated compression reaction of 0.02 seconds with independent volume controls give you greater control over the sound. PROTECT YOUR HEARING: Protect your hearing at the firing range with the Walker's Razor Slim Protection Muff with low noise/frequency tuned for natural sound clarity; operates on 2 AAA batteries (included).