... with timer, Economical power consumption, oxygen concentrator, portable oxygen generator,3L outflow, with timer, Economical power consumption,30% oxygen. Air ... flow volume: 3L/min Noise: <46dBOxygen concentration: 30% Power: 25WVoltage: 12V DCDimensions ... 0.5kg spare parts)steady oxygen outflow, coninous outflow, 3L portable oxygen concentrator