oxygen concentrator 3L, 5L, 6L, 8L, 10L/min with large LCD, Realtime oxygen concentration display, Intelligent fault diagnos Professional manufacturer of oxygen concentrator in Chinaoxygen concentrator 3L, 5L, 6L, 8L, 10L/min with large LCD, Oxygen Concentration Display Red, green, yellow Bar & realtime concentration display on the LCD.Specification*Model OC-POperating SystemTimed Cycle/Rapid ...