The New Gold II Series was designed similar to the Pro Ears Golds, however Pro Ears removed the ear jacks to reduce cost in the manufacturing process. Pro Ears Golds are still the world's most advanced electronic ear and hearing protection for shooting, hunting, and industrial applications. Their superior technology allows the competitive shooter, hunter, and law enforcement agent to hear every sound, including conversation, even during high volume noise spikes. Pro Ears electronic earmuffs achieve a perfect balance between comfort, noise attenuation, and purity of sound. The Pro Ears gold II 30 amplifies sounds up to 8x with high fidelity. Proprietary DLSC compression technology for a clean and natural uninterrupted sound quality while shooting. Features: Proprietary DLSC compression technology for a clean and natural uninterrupted sound quality while shooting Gel ear seals with proprietary design for extra comfort and extended wear in hot and cold climates Amplifies sounds up to 8x with high fidelity and has a 1.5 millisecond response time Separate volume controls for fine-tuning to your hearing requirement in each ear Noise reduction rating (NRR) is 30 Auto shut off Low battery indicator Uses four (4) AAA batteries (not included) Five (5) year Warranty. Military grade circuit boards Made in the USA