This product includes : 4 Adult Israeli gas masks, 4 NBC Filter Type 80 sealed ( Original with this masks). The Israeli Gas mask is considered by professional reviews as one of the most reliable gas mask in the market. Now available for the public for an incredible price. Won"t last for long!The Air supply unit is a compact and reliable air-supply unit that maintains positive pressure within all civilian NBC protective systems. Supplied with 4 lithium batteries for each air unit supply