Pyramex's venture gear sentinel electronic earmuff features slim profile ear cups, fold-away, padded headband, and a front facing microphone.The muff helps amplify hearing, while compressing harmful sounds and reducing them to a safe level.It also has an auto shut-off after four hours, 3.5 mm aux jack for use of mp3 and mobile devices, and height adjustment to fit all sizes.Type: Electronic EarmuffColor: Black Ear Cups w/Black BandNrr: 26 dBQuantity: 1 PairStyle: Over the HeadBattery: AAAMaterial: Polymer