Oxygen therapy is typically need of  breathing problems, lung disease, cancer, or heart problems. Roller Base for easy movement. Pressure Swing Adsorption Technology. Readily accessible patient controls and protected cannula fitting. Convenient side handles for easy transport. Single or dual flow (for two patients). Option for Nebulization The Air Outlet option enables to deliver medicated nebulizer treatments while simultaneously providing supplemental oxygen. Capacity 5 ltr per minutes.