Introducing the Walker s Low-Profile Recon Digital Electronic Muff in Black is designed with lightning-fast Sound Activated Compression (SAC) at their core, these muffs boast a noise reduction rating (NRR) of 26 capable of keeping wearers hearing protected in any arena. This set contains Walker's Recon Low-Profile Digital Electronic Muff with SAC Technology and NRR 26 (Black), 2 x Aaa Battery, and Limited 1-Year Warranty.