LifeChoice® Activox Portable Oxygen Concentrators (POC) are manufactured by Inova Labs to provide Respiratory Therapy Patients with more freedom and mobility. The LifeChoice Activox Concentrators are Portable Oxygen Concentrators available in three models,—Sport Model with a weight of 3.9 pounds and battery life of 3.25 to 5.5 hours, —Pro Model with a weight of 4.3 pounds and a battery life of 6.25 to 12.5 hours, and —4L Model with a weight of 4.8 pounds and a battery life of 4 to 10.25 hours . The Activox Oxygen Concentrators come with Sleep Mode technology. This technology allows oxygen patients to use the LifeChoice Activox POC continuously 24 hours a day, 7 days a week. The Sleep Mode setting increases the sensitivity of the concentrator to detect breathing by 10 times, ensuring the LifeChoice can detect nighttime breathing and still supply the patient with the necessary oxygen therapy. The LifeChoice Activox Oxygen Concentrator is a pulse dose system designed for oxygen patients requiring 1 to 3 liters per minute (LPM) of supplemental oxygen.