Rifleman Sound Amplification and Suppression Electronic Hearing Protection Earmuffs for Shooting & Hunting Ideal for indoor or outdoor use - rifles, shotguns, handguns and pistols Moderate noise protection with Noise Reduction Rating (NRR) of 21 Collapsible ear muffs for easy storage and no exposed wires that can tangle or be pulled out Slim headband and can be worn with combat helmets, hats and other headgear Input jack for external entertainment or communication Quality sound from dual circuit boards Designed for the shooter who wants great value in electronic hearing protection Weighs only 8.3 ounces, with low profile cup design Requires four (4) AAA batteries (not included)