* The Zen-O lite portable oxygen concentrator is characterized by reliability and flexibility, and Zen-O lite supports the active lifestyles of patients who need oxygen therapy. * * Zen-O lite features breath sensing accuracy and a therapy response rate (RRT) that allows for rapid detection of breathing and delivery of the required oxygen. * * The therapy response rate (RRT) Zen-O lite delivers oxygen on demand, which is triggered by the patient's inhalation. Whether the patient is climbing stairs or walking, the Zen-O lite will automatically respond to the breathing rate by adjusting the amount of oxygen needed to ensure the patient remains saturated with oxygen. * Made in: England The device is new in its box, unused, with all its accessories Features and Benefits: Pulse mode, up to 1050 ml * * Zen-O lite provides up to 1050 ml of oxygen per minute in pulse mode and can be adjusted in increments of 0.5 up to setting number 5. Negotiable