Inogen, Inc. (Inogen) is a medical technology company. The Company develops, manufactures and markets portable oxygen concentrators used to deliver supplemental long-term oxygen therapy to patients suffering from chronic respiratory conditions. It offers Inogen One systems for the patients who require long-term oxygen therapy. The Company�s products include Inogen One G3 and Inogen One G2. The Inogen One G3 and Inogen One G2, weighs at approximately 4.8 and 7.0 pounds, respectively, are amongst the most lightweight portable oxygen concentrators. It markets its product offerings, the Inogen One G3 and the Inogen One G2, as single solutions for oxygen therapy. One G2 is effective for nocturnal use. Its Inogen One G2 and the Inogen One G3 are sub-5 and sub-10 pound portable oxygen.