AngelBiss, established in 2004,located at Shanghai China, is the first only one focus on fluctuation of an oxygen concentrator and can control the fluctuation rate within0.1%, mainly engage in development, exportation and manufacturing quality products on the field of Oxygen Therapy, Surgery Therapy, Asthma Therapy and Diagnostic Therapy. With its own unique advantages and powerful engineering capabilities, AngelBiss has provided many high-quality solution to customers all over the world. Ange