Key features, Psa technology this pressure swing adsorption psa technology easily extracts oxygen from atmospheric air, Quick features 93%, Dual filtration, Inbuilt nebulization chamber, High 02 purity, Inbuilt purity meterdigital & digital auto, Manual flowmeter shut, Off timer, Digital usage meter, High, Quality molecular sieve, Adjustable flowrate, 48 hours continuous User-friendly design, Oxygen supply whether the user is professional or not, The users can operate this aero oxygen therapy machine by themselves after reading this user large lcd, S manual display the concentrator s large lcd display showcases present timing, Accumulating timing and presetting timing digital operation, On screen the concentrator can calculate pressure, Temperature, Purity and spo2 digitally in maintenance reminder, Real time gives a reminder alert for its regular maintenance