The Pro Ears Gold II 30 amplifies sounds up to 8x with high fidelity. Proprietary DLSC compression technology provides for a clean and natural uninterrupted sound quality while shooting. Ideal for indoor or outdoor range use, the Gold II 30 features auto shutoff, military grade circuit boards, low battery indicator and separate volume controls for fine-tuning to your hearing requirement in each ear. Incredibly comfortable gel ear seals with a proprietary design for an improved seal and extended wear in hot and cold climates, along with a lightning fast 1.5 millisecond response time, an industry-leading five (5) year warranty and reliably made in the USA are the other benefits of the Pro Ears Gold II 30 Series.