◎1L portable oxygen concentrator, 1060ml per minute , ◎ oxygen concentration is 90%—3%/+6% max. ◎ 1~5 flows with different oxygen supply level, if in 5th flow,you will get 1L oxygen in one minute. ◎ 1.95kg light weight ◎ Pulse Dose oxygen supply,deliver O2 based on breathing rates O2 utilization rate is 100% in Pulse Dose,but only 20% in Coutinuous Flow, so Kingon P2 is equal to a 5L oxygen concentrator ◎ 3 years warranty time (excluding the filter , sieve bad & battery ◎ Battery duration time 2~5 hours ◎ AC & DC power supply