The Gold Series Advantage is the balance achieved between comfort, noise attenuation and purity of sound. No compromises. No excuses.Features:- NRR 33- Weight: 13.5 oz- Five Year Warranty- Large ear cup designed for extreme noise environment. Maximum hearing protection- Great for range masters and shooting instructors- Best firearms shooting protection in covered or indoor shooting ranges- Ideal for use with all handguns- Great for flight crews conducting pre-flight inspection- Apple iPod, CD, motor sports scanner or radio compatible using a 3.5 mm mini jack. Enjoy high fidelity sound while protecting your hearing- Listen only communications- Uses Lithium 123 Style Battery