Protect your Hearing: Protect your hearing at the range with Walker’s Razor Series Hearing Protection Earmuff with low noise/frequency tuned for natural sound clarity; Quantity: 3 earmuffs. HD Speakers: Features full dynamic range HD speakers for clear balanced sound with sound-activated compression reaction of 0.02 seconds. Input Jack: Includes audio input jack and recessed volume control knobs; Independent volume controls give you greater control over the sound. Comfortable Design: Features a comfortable headband with a metal wire frame that folds for easy storage; Operates on 2 AAA batteries (included); Dimensions (L x W x H): 8.1 x 3.8 x 10.6 inches.