The Oxymed Battery-Powered Oxygen Concentrator stands as a portable, medical-grade apparatus with a remarkable battery backup of up to 10 hours, especially when equipped with a double battery, maintaining a stringent medical-grade purity of 90 /- 3%. This product has secured both FDA approval and CE certification, offering an extensive 3-year warranty for the unit and an additional 1-year warranty for the battery and sieve beds—marking it as one of the most comprehensive warranties available in similar products. Furthermore, its FAA approval allows hassle-free carriage during flights.   What’s in the Box? Nasal Cannula AC Power supply Oxymed P2 unit User manual DC Cable for use in car Single or Double Battery (Depending on the variant) Sling bag to carry machine on shoulder Free Backpack included with double battery variant   Technical Details: Weight: 1.98kg Battery backup (at 2 pulse setting): 3.8 hours Type: Portable (Battery powered) Recharge time: 4 hours Pulse Flow: 5 Pulse setting Dimensions: 8.70H x 6.30W x 3.35D inch Purity: 90-96% Backup with external battery pack: 10 hours Oxygen Purity Indicator (OPI) Sound level: 49db Operating altitude: 10000 feet