1. Portable oxygen concentrators use the principle of pressure swing adsorption, taking air as the raw material and zeolite molecular sieve as the adsorbent to separate oxygen from other gases such as nitrogen in the air. At normal temperature and pressure, high - concentration oxygen can be continuously separated from the air when powered on. 2. Product name: Oxygen concentrator 3. Specification: Fully intelligent version with automatic power - off protection 4. Dimensions: 13.39 * 7.09 * 12.21 inches. Suitable for an area of 30 m 5. Style: Oxygen therapy 6. Application range: 10 - 20 m 7. Ambient temperature: 0 - 40 C 8. Atmospheric pressure range: 96 - 106 kPa 9. Air volume: 51 - 150 m/h 10. Oxygen concentration (%): For the 2L machine, the oxygen concentration is over 90%, with high oxygen flow rate 11. Net product weight: 14.33 pounds 12. Rated power (W): 130W 13. Applicable voltage: AC220 14. Features: - Function: 6 million times per cubic meter - Timing function, with a maximum of 180 minutes - Energy - saving mode - Sleep mode