The Inogen One G5 delivers the independence of a portable oxygen concentrator in one of the most powerful, lightest and quietest units available to the oxygen user today. With flow settings 1-6, the Inogen One G5 delivers 24/7 oxygen delivery in a strong, yet compact package. With the Inogen One you can jump in the car to run errands, take a weekend trip to see family, or even take it on vacation! The Inogen One G5 meets FAA requirements.