Protect yourself from nuisance dust with this effective positive pressure cartridge mask that is not only comfortable, but quite affordable. The Power Mask is lightweight and because it is positive pressure it doesnt have to be pulled tight on your face. Youll appreciate the comfortable, secure fit. The small 2-speed fan that is built into the front of the mask pulls air through the filter, continually providing clean and cool air. The quiet motor runs on 4AA batteries (not included) and has a handy belt clip.Three dust cartridges and 10 pre-filters included.