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 all feature Safe Level Sound Compression Technology with a refresh time less than 1 ms. Two Full Dynamic Range HD speakers ensure everything you hear is crystal clear. Omnidirectional microphones pick up everything around you, giving a natural sound while minimizing wind noises. This model is Bluetooth-enabled and has the ability to take and receive phone calls. This Elite model also takes technology to the next level by incorporating rechargeable lithium-ion batteries (12 hr runtime) and active noise cancellation making sure unwanted ambient noises are eliminated.Features:Safe level sound compression technologyAcoustic foam for all day comfortSound refresh time less than 1 ms2 full dynamic range high definition speakers5 omnidirectional microphones6x amplification12 hr runtime3 hr automatic shut off