Inogen, Inc. is a medical technology company. The Company is engaged in developing, manufacturing and marketing portable oxygen concentrators used to deliver supplemental long-term oxygen therapy to patients suffering from chronic respiratory conditions. The Company offers Inogen One systems, such as Inogen One G3 and G2 that concentrate the air around the patients to offer a single source of supplemental oxygen. The Inogen One G3 and G2 have up to 4.5 and five hours of battery life respectively. The Company's Inogen One G2 is effective for nocturnal use.