Champion Vanquish Pro Elite Gray Electronic Earmuffs - 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 lt;1ms. 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. Vanquish Pro Elite models are Bluetooth-enabled and have the ability to take and receive phone calls. The Elite models take technology to the next level by incorporating rechargeable lithium-ion batteries (12-hour runtime) and active noise cancellation making sure unwanted ambient noises are eliminated. Safe Level Sound Compression Technology Acoustic Foam For All Day Comfort Sound Refresh Time