... step reduce pressure,simple operation,high safety,the Max.flow speed is 30I/MIN Pulse-charge,auto alarm function,set up two ... .flow speed is 30I/minTechnical Data:Power supply:AC110/220V(±)10%,50/60Hz,0.5AFlow rate setting (three level):10/20/30/min ... The maximum flow speed is 40I/min; reduce pressure set up ...