Inogen’s portable oxygen concentrators are reliable and easy to use. The G3, G4, and G5 settings buttons are easily visible. These devices also have a range of oxygen flow settings that allow users to adjust the flow based on their health care provider’s recommendations: 1–5 settings for the G3, 1–3 settings for the G4, and 1–6 settings for the G5.
The rechargeable battery is easy to replace and the company has video instructions on its website. You can view the battery level on the device or, for the G3 and G5 models, on the Inogen Connect smartphone app.