Walkers Razor X-TRM Digital Earmuffs 21 dB NRR Gray. Available in Black Brown and Flat Dark Earth. The Razor Slim XTRM series features cooling headband Noise Reduction Rating (NRR) of 21 dB and utilized sound activated compression (SAC) of 0.02 seconds. SAC is a special electronic circuitry that will compress gun shots and other loud noises down to a safe level without completely shutting the noise off. This allows you to hear range commands or communicate with your hunting partners even when shots are being fired around you. Your hearing cannot be replaced so make sure you pick up a set of Walkers Razor Electronic Earmuffs for your next trip to the woods or range. Includes 2 AAA batteries. Specifications for Walkers Razor X-TRM Digital Earmuffs: Manufacturer: Walkers Fabric/Material: Polymer NRR: 21 dB Quantity: 1 Size: One Size Battery Type: AAA Battery Quantity: 2 Age Group: Adults Features of Walkers Razor X-TRM Digital Earmuffs Ultra Low-Profile Design; Cool Mesh Headband; Comfort Gel Earpads; Rubberized Coating; Two Hi Gain Omni Directional Microphones; Audio Input Jack; Low Noise / Frequency Tuned For Natural Sound Clarity; Volume Control; Compact Folding Design; Comfort Headband W/ Metal Wire Frame; Sound Dampening Composite Housing; Nrr 21; Sound Activated Compression Recessed Volume; Control Knob External Battery Door; Operates on 2 AAA Batteries Included; Package Contents: Walkers Razor X-TRM Digital Earmuffs Digital X-TRM Ear Muff 2 AAA Batteries Walkers GWP-XDRSEM-GY: Razor X-TRM Digital Earmuffs 21 dB NRR Gray