The Walkers line of products is widely considered the industry standard for shooting protection and safety. Walkers continues to raise the bar with enhanced safety products that offer unparalleled comfort and performance. Features : Advanced Digital audio circuit IPX4 Rated Digital MEM Low noise microphones deliver clear sound Full dynamic range HD Speakers for clear balanced sound Split second (SAC) Sound Activated Compression Sound dampening composite housing with bonded rubber coating Auto shut off 2/4/6 hours 3.5mm audio jack NRR - TBD