Walker's XCEL 100 Digital Electronic Muff with Voice ClarityThe Walkers XCEL 100 Digital Electronic Muff features an ergonomic headband design with controls for maximum comfort and convenience. It has rubber bumpers on lower cups and fewer holes in the muff cups for improved NRR. Powered by the two included AAA batteries this headphone gives low battery warning. It has auto shut off function at 2 4 6 hours. Crisp and Clear Sound This Earmuff includes four listening modes Universal, Speech Clarity Mode, Hi