Walkers New Digital Razor in Flat Dark Earth color and US Flag print. The Walker's Digital Razor Electronic Earmuffs are designed with a new ergonomic head band design for comfort and support. They feature a powerful NRR rating of 23dB, as well as active dynamic sound suppression for safety at the range. Features - Advanced Digital Circuit - Active Dynamic Sound Suppression - Hi Gain Omni Directional Mics - Lighting Fast Reaction Time Wind Noise Reduction - Auto Shut Off at 2/4/6 Hours - NRR 23 d - B(2) AA Batteries