Peltor sport rangeguard electronic hearing protector is ideal for range and hunting use.It suppresses gunshot noise to protect hearing with a noise reduction rating (nrr) equal to 21 db while amplifying voices for clear communication.It has an adjustable, padded headband, and its' low-profile cup design works with shotguns and rifles.The rangeguard features durable, recessed microphones with single on/off and volume control, and a 3.5 mm audio input jack for mp3 and 2-way radio compatibility.It runs on 2 aaa batteries (not included), accessed by a single, external battery door and 4-hour auto shut off to preserve battery life.Type: ElectronicColor: Gray/BlackNrr: 21 dBQuantity: 1 PairStyle: Over the HeadAft Circuit: YesBattery: AAACompression Circuit: YesMaterial: Polymer