Protect your hearing in the field with the Protective Muff. Includes audio input jack and built-in volume control knobs. Features a comfortable headband with metal wire frame that folds for easy storage. Works on 2 AAA batteries. Composite housing gives you more effective soundproofing. Independent volume controls give you greater control over the sound. Features full dynamic range HD speakers for clear balanced sound with sound activated compression response 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. Please note: It is normal for the product to have chromatic aberration due to lighting problems. Ultra low profile ear cups. Full dynamic range HD speakers for clear balanced sound. Single knob volume control. Sound activated compression circuit (SAC). According to your choice (choose the last one then just the case). X Headset (green/desert/black/Camouflage/Fde) or. X Headset with case.