The redesigned DeVilbiss iFill Personal Oxygen Station was updated with improved reliability and durability in mind. The iFill represents the latest in portable oxygen convenience, providing unmatched flexibility and ease of use. The iFill unit extracts purified oxygen from room air using oxygen concentrator technology and pressurizes it to fill oxygen cylinders. Cylinders are safely, quickly and conveniently filled in your home. The iFill can be placed and used virtually anywhere in the home, minimizing the noise and disruption to daily life. iFill must be used with iFill cylinders. Comes with the DeVilbiss iFill Personal Oxygen Station, 2 cylinders, and carrying case.