The Longfian JAY-5BW is a medical portable 5L oxygen concentrator machine for COPD patients and other oxygen therapy. Max flow rate is 5L with normal flow meter. Especially for home care, shopping, traveling, car, etc. Outdoor application. This model can produce an average of 93% purity oxygen to meet 5 liter flow requirements of hospital, clinic, home use, nursing center. It can stably work 24 hours a day and always maintain oxygen purity at an average of 93% at 5L/min flow.