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. Ideal for indoor or outdoor range use this gold II 30 features auto shut off military grade circuit boards low battery indicator and separate volume controls for fine-tuning to your hearing requirement in each ear. Gel ear seals with a proprietary design for extra comfort and extended wear in hot and cold climates.