Inogen One G3 Portable Oxygen Concentrator System with Extra 16v Battery, Columns, Bag & Accessories

The machine is like new. We bought extra batteries for use in airports and in airplanes. We have the instruction manual. You get the whole set up for $1750 which includes the concentrator, carrying case, 3 16- cell extended batteries (these normally cost $500 each), and 2 chargers including one for the car.