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