The function of oxygen generator is to relieve nervous fatigue, relax body and mind, maintain powerful energy and improve work efficiency, improve the oxygen supply of the brain, regulate the function of the brain nervous system, improve memory and thinking ability, and improve learning efficiency. Adjustable Concentration Continuous flow rate 1-5l/min adjustable: 40% – 90%. (1L 90%±5%; 2L 75%±5%; 3L 55%±5%; 4L 45%±5%; 5L 40%±5%) Special Note: This is auxiliary household equipment, non-hospital oxygen generator, only suitable for daily health care. It is not recommended for people with serious illnesses or people who rely on medical oxygen to sustain their lives. Smart Operation, stunning large IMD color panel and IR remote control more convenient. It can be timed for 2 hours. If you don't want to set the time, you can press "Tim" to subtract the set time or restart the oxygen generator for continuous use. Sifted Oxygen Molecular Generator: The molecular oxygen generator is an advanced gas separation technology. The physical method (PSA) extracts oxygen directly from the air, ready to use, fresh and natural. No fogging. Oxygen concentrators are suitable for people suffering from oxygen therapy and oxygen The elderly, pregnant women, students working for a long time in mental work, company employees, government officials, etc.