With an incredibly robust magnesium case and an extended battery life, the OxLife Independence Portable Oxygen Concentrator is an ideal all-in-one solution for active oxygen users. The Independence is equipped with a dynamically balancing integrated travel cart and handle so it feels lightweight and agile in the house or on the road; and it can be operated at ALL settings -- Continuous Flow & Pulse Dose -- from all power sources including AC, DC and battery.