Oxygen concentrator brand
First place: Shenyang-Xinsong oxygen concentrator
Second place: Suzhou-Invecon oxygen concentrator
p>Third place: Foshan-Kaiya Oxygen Concentrator
Fourth place: Jiangsu-Yuyue Oxygen Concentrator
Fifth place: Zhongshan-Rongjie Manufacturing Oxygen machine
For reference only, wish you good luck!