Longfian Scitech Co., Ltd, a leading manufacturer specialized in oxygen solutions for 25 years, has been professionally dedicated to R& amp; D, production and marketing of various oxygen concentrators which include medical oxygen therapy, indoor oxygen supply, plateau simulation, industrial, veterinary and other fields. Longfian is headquartered in Baoding, China. We have 520 employees, covering an area of 40,000 square meters, with annual production capacity of 1.5 million units.