Noise Canceling Electronic Ear Muffs - Protection Shoot Hunting Gun Sport Tactical Safety Blocking Gun Firing Range Eye Firing Screens out noise over 85dB - NRR 24 Over 200 hours battery life on two AA batteries (sold separately) Hands-free operation LED indicator light Solid state circuitry Great for hunting shooting construction firing ranges Gun ranges Blocks out all noise over 85db, you can carry conversation and hear all surroundings until loud sound is emitted