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's Inogen One systems concentrate the air around the patient to offer a single source of supplemental oxygen anytime, anywhere with a portable device weighing approximately 4.8 or seven pounds. Its Inogen One G2 and Inogen One G3 have approximately five and 4.5 hours of battery life, respectively, with a single battery and can be plugged into an outlet when at home, in a car, or in a public place with outlets available. The Inogen At Home stationary oxygen concentrator allows it to access the non-ambulatory patient market and serves as a backup to its Inogen One system for ambulatory patients. The Company sells its products to home medical equipment providers in the United States and in foreign countries.