Supplied fresh air respirator system is equipped with portable power source mainly overcome the problems of big air intaking resistance, difficulties in breathing and so on. This system use the air pump to transport the air to the mask. You could fix the air pump on your waist, so you are more close to the air source. The charging time is 3 hours and you could use it for 7 hours with the fully charged battery. The canister comes with the unit can filters a variety of harmful gas. The filter can be used for benzene, chlorine gas, acetone, alcohol, aniline, disulphide, carbon tetrachloride, chloroform, bromomethane, chloromethane, chloride, chlorinated sodium chloride, paint and its derivatives. Charging time: 3 hours. Working time: 7 hours. Charger Voltage: 110 V / 220 V. Air supply flow rate: First gear: 62 L/min Second gear: 74 L/min. Net weight of the air pump : 0.6 kg. 1 x air pump. 1 x full face mask. 2 x air pipe. 1 x canister filter. 1 x recharger.