Double flow oxygen concentrator O2 concentrator 10L pre-concentrator 10 liter oxygen concentrator, he is suitable for mental workers, students, white-collar; Patients with cardiovascular and cerebrovascular diseases; Patients with respiratory diseases; Three high population; Overweight people; People over 60..... It has a 10-inch large screen, and can display the value of oxygen concentration in real time, so that we can see oxygen, ultra-quiet design, a new realm of oxygen production, but also remote control, easy to operate, save worry and save effort, atomizing oxygen two functions to achieve a dual-use machine