Aero, like other portable O2 concentrators, provides oxygen to patients with lung defects while on the go, only it has the advantage of never requiring a refill. Its slim, comfortable profile makes it easy to conceal, giving users the closest experience possible to not requiring supplemental oxygen at all. Better yet, it comes with a stylish backpack adapted for the necessary tubing and equipment. It even has an integrated control to increase or decrease the flow discretely.