Pro Electric Constant Flow Supplied Air Fed Half Face Gas Mask Respirator System. Charging time: 3 hours. Working time: 7 hours. Charger Voltage: 220 V. Air supply flow rate. First gear: 62 L/min. Second gear: 74 L/min. 1pc of air pump. 1pc of half face mask. 2pcs of air pipe. Return accepted in 30 days after you receive the item. Return package must be in the original packaging, item must be in new condition.