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