Peltor, Sport Tactical 100 Earmuff, Electronic Hearing Protectors, 22 DB Noise Reduction Rating, Adaptive Frequency Response Reduces Background Noise For Clearer Conversations & Hearing Of Commands, Variable Suppression Time Feature Provides Optimal Echo Reduction In Indoor Shooting Environments, Re-Engineered Headband For Improved Fit & Comfort, Low Profile Cups For Rifle/Shotgun Use, Polyurethane Gives Excellent Protection With Wet Jobs, 2 Hour Auto Shut-Off, Easy Access Battery Door With Tether, Runs On 2 "AAA" Batteries Not Included, 3.5 mm Audio Input Jack Compatible With Most MP3 & 2-Way Radios, Ideal For Both Indoor & Outdoor Shooters & Hunters.