The Oxysaver oxygen-conserving cannula is a single-user product for the nasal distribution of oxygen. A reservoir fills with 18ml of expired air at the initial phase of expiration, which is then enriched or replaced with oxygen during the remainder of expiration. Then a diaphragm immediately collapses on initial inspiration, delivering a dose of highly oxygen-enriched air to the deepest portion of the lungs. Features: Soft nasal prongs which offer maximum comfort and place less pressure on the septum For oxygen delivery up to 18,000 feet MSL Comfortable: talk, eat, or drink For use with AEROX flow control and other systems able to deliver low oxygen flow Extend oxygen duration by up to eight times compared to non-altitude compensated systems with masks or standard cannulas The only conserving cannula approved for aviation use by the manufacturer and tested to 18,000 feet