portable Inogen One G5 Oxygen Concentrator is used on a prescriptive basis by patients requiring supplemental oxygen. It supplies a high concentration of oxygen and is used with a nasal cannula to channel oxygen from the concentrator to the patient. Comes with 2 batteries…everything equipment,battery, carrying case. electric cord. Still under warranty…..we are located in the Remington Subdivision. This unit was rarely used, still like new…all questions answered