Champion Vanquish Electronic Hearing Protection was designed from the ground up for the shooting sports. Each muff was acoustically modeled on gunshot reports to achieve the optimal balance of all day comfort and noise reduction. They feature Safe Level Sound Compression Technology with a refresh time Features: Electronic hearing protection AAA batteries 200+ hour run time Can hold a conversation without cutting out Soft cushion ear cups Side cut for fit around a gunstock Adjustable volume Optional Bluetooth