The low profile electronic muff features a single wind resistant, high frequency microphone with and single volume control knob.It has a sound activated compression with 0.02 second reaction time.The muff also has a compact folding design and operates on one (1) aaa battery (included).Type: Electronic EarmuffColor: Gray Ear Cups w/Black BandNrr: 24 dBQuantity: 1Style: Over the HeadBattery: AAAMaterial: Polymer