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.