Introducing the Razor Slim XTRM series - featuring an innovative cooling headband, a robust Noise Reduction Rating (NRR) of 21 dB and groundbreaking sound-activated compression (SAC) technology with an ultra-rapid 0.02-second response time. This advanced SAC system adeptly moderates loud noises, such as gunshots, to safer levels while preserving essential auditory awareness. Bid farewell to complete noise isolation, as you'll effortlessly hear range commands and stay connected with hunting companions even amidst gunfire. Prioritize the protection of your precious hearing by choosing Walker Razor Electronic Earmuffs for your next wilderness adventure or shooting range visit. Plus, the package includes 2 AAA batteries for your convenience.