oxygen generator, portable oxygen concentrator, 40% to 70% stable oxygen outlet with timer and bag. Air flow volume: 1 to 3L Oxygen Concentrator, oxygen generator, portable oxygen concentrator, 40% to 70% stable oxygen outlet with timer and bagoxygen generator, portable oxygen concentrator, 40% to 70% stable oxygen outlet with timer and bag.Air flow volume: 1 to 3L/min light and with a carry bag