This is an InogenOne G2 concentrator that is small enough to carry on your shoulder, hang on the back of a car seat, or move around on a small hand cart (which comes with this unit). It has a max output 6 liters and runs very quiet. It comes with one battery in the unit and an additional battery. Shoulder carry case included. Also included is a bunch of air tubing and canulas. A wall plug-in battery charger as well as a vehicle charger are included! As you can see in the pictures, a new G4 unit costs $2500 so the price of this 3 year old unit (with an extra battery) is a steal! $1600 gets you everything listed here.
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