This is a Pro Ears Pro Tac Mag gold NRR 30 electronic ear muffs W/lithium 123 batteries. The Gold Series advantage is the balance achieved between comfort, noise attenuation and purity of sound. No compromises. No excuses. Natural replication of amplified sound. Features: - 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 - NRR 30 - Weight: 13.5 oz.