Protect your hearing at the range with the Protection Muff. Includes audio input jack and recessed volume control knobs. Features a comfortable headband with metal wire frame that folds for easy storage. Operates on 2 AAA batteries. Composite housing gives you more effective sound dampening. Independent volume controls give you greater control over the sound. Features full dynamic range HD speakers for clear balanced sound with sound activated compression reaction of 0.02 seconds. Low noise / frequency tuned for natural sound clarity. Dimensions (L x W x H): 8.1 x 4.6 x 10.6 inches. Weight: 0.98 pounds. Please note: It is normal for the product to have chromatic aberration due to lighting issues. Ultra low profile ear cups. Full dynamic range HD speakers for clear balanced sound. Low noise/ frequency tuned for natural sound clarity. Single knob volume control. Sound activated compression circuit (SAC). 9 9 9 9 9.