Peltor Sport Electronic Hearing Protector, Ear Protection NRR 21 dB 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 & 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)