... 3L, 5L, 6L, 8L, 10L/min with large LCD, Realtime oxygen concentration display, Intelligent fault diagnos ... Chinaoxygen concentrator 3L, 5L, 6L, 8L, 10L/min with large LCD, Oxygen Concentration Display Red, green, yellow Bar & ... Relief ValveAir outlet permits nebulizer treatments optionalStatus Display ScreenLarge scale LCDVoice reminderOptionalOxygen Concentration DisplayRed, green, yellow Bar & ...