Product introduction: GVS 5L Medical Oxygen Concentrator is a device that extracts oxygen from atmospheric air. It will typically be an electrically-powered molecular lsieve (artificial zeolite) used to separate nitrogen from ambient air and produce purity of oxygen. It could be applied widely in the hospitals at all different levels, clinics, health centers and family nursing, health care for the old person, mental workers and students, etc.. This Home Oxygen Therapy machine is very easy to operate by simply following this installation video or follow the users manual . The home oxygen concentrator can supply oxygen to one patient, with steady oxygen flow from 1 to 5 litres per minute. Medical oxygen concentrator is safe and reliable to use. Visit at the following link https://medicalbulkbuy.com/product/gvs-5l-medical-oxygen-concentrator/