Peltor Sport Range Guard Electronic Hearing Protector suppresses gunshot noise to protect hearing while amplifying voices for clear communication. Ideal for range and hunting use. FEATURES: Ideal for both indoor and outdoor shooters and hunters Suppresses gunshot noise to protect hearing while amplifying voices for clear communication Low profile cup design proven to work with shotguns and rifles Re-engineered headband for improved fit and comfort 4-hour auto shut-off Easy-access battery door with tether (runs on 2 AAA batteries; not included) 3.5 mm audio input jack compatible with most MP3 players and 2-way radios Durable recessed microphones