The AKT1 Sport Cadre Slim 22dB NRR Electronic Hearing Protection - Black features a low-profile, thin earcup design making them perfect for use with rifles and shotguns. The adjustable headband provides a secure fit and includes hook-and-loop on one side for morale patches. This pair of earmuffs operates on 2 AAA batteries (not included) with up to 400 hours of battery life.Specifications and Features: Low-profile, thin earcup design Adjustable headband for secure fit Hook-and-loop on one side of headband for morale patches Operates on 2 AAA batteries (not included) Up to 400-hour battery life 4-hour auto-shutoff 2 hi-def multi-directional microphones 6x sound amplification Single volume control NRR of 22dB