The preowned Inogen One G4 portable oxygen concentrator is one of the lightest portable units in its class. It weighs less than 4 pounds with an 8-cell battery and has 3 settings. The 8-cell battery can hold up to a 4 hour charge. The Inogen G4 portable oxygen concentrator is great for both local use, and use while traveling. It has the ability to charge in the car or in the wall and can be used simultaneously while charging. The charger and other accessories are included with the preowned Inogen One G4.

The Inogen One G4 also has an easy to read LCD screen so you will always know what setting you are on, as well as the exact percentage of battery life when mobile.