... 93+/-3%, CE0123, Free sale Professional manufacturer of oxygen concentrator in Chinaoxygen generator (concentrator) OC-E50 5L/ ... min w/timer & oxygen concentrator indicatorGreen,yellow, red bar on the LCD ... TypeClass IIaSafety Alarms & FeaturesPower Failure, High Pressure / Low Pressure, Low Oxygen Concentration, Temperature, Current overload or line surge shutdown, ...