MSA OptimAir  Mask-Mounted PAPR Upgrade Kit is specifically designed for Advantage  3000, Advantage  4000, Ultravue? and Ultra Elite? facepiece. OptimAir  MM2K powered Air purifying respirator is precision-crafted to provide long life, high performance and low maintenance. Water-resistant HEPA filter helps protect against particulate contaminants. Compact, Easy to-decontaminate model uses a rechargeable NiMH battery for 8 hrs of continuous use, while a dual-rate smart charger fully powers a discharged battery in less than 3 hrs. Kit contains blower, NiMH battery, dual-rate battery charger and cable, one Type HE OptiFilter cartridge and a waist belt.