The Venture Gear Powder Blue Electronic Earmuff with Black Headband feature slim profile ear cups, fold-away, padded headband, and front facing microphones. They also feature automatic shut-off after four hours, 3.5 mm Aux jack for use of MP3 and mobile devices. These earmuffs amplify hearing while suppressing harmful sounds and reducing them to a safe level. 2 AAA batteries are included.