①. The portable oxygen concentrator uses the principle of pressure swing adsorption. Air is used as the raw material. Zeolite molecular sieves are used as adsorbents to separate oxygen in the air from other gases such as nitrogen. Under normal temperature and pressure, a high concentration of oxygen can be continuously separated from the air when the power is turned on. ②. Product Name: Oxygen Machine ③. Specification: Fully intelligent version, automatic power - off protection. ④. Size: 13.39 * 7.09 * 12.21 inches. ⑤. Application space: 30m². ⑥. Style: oxygen therapy. ⑦. Application volume: 10 - 20m³. ⑧. Ambient temperature: 0 - 40 °C. ⑨. Atmospheric pressure range: 96 - 106 kPa. ⑩. Air volume: 51 - 150 m³/h ⑪. Oxygen concentration (%): oxygen concentration above 90%, high oxygen flow ⑫. Product net weight: 14.33 pounds ⑬. Rated power (W): 130 W ⑭. Applicable voltage: AC220V ⑮. Functions: - negative 6 million per cubic meter; - Timing function up to 180 min; - energy saving mode; - sleep modeNote: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!