I am selling a large oxygen concentrator as I no longer need it, having rented one. An oxygen chamber is also included. Manufactured in 2021, purchased new on September 10, 2023. * The zeolite and compressor have a lifespan of approximately 2500 hours. According to the catalog specifications, it provides 1.5-9L at 1.5L/90 ± 3%. Please consult with your doctor regarding precautions, necessary environment, and oxygen concentration levels when using the oxygen concentrator. Operation has been confirmed. Oxygen Concentrator Model: MAF005-1W Power Consumption: 105W Noise Level: 48dB or less Oxygen Concentration: 90 ± 3% (1.5L/min) Air Pressure: 100KPA or less Airflow: 1.5-9L/min Weight: 6.8kg Size: 360 x 203 x 364mm Included Parts: See photos * Can operate continuously for 168 hours, but requires a 30-minute rest period. ⚠️60Hz. This cannot be used in 50Hz regions. The original box has been disposed of, so it will be packed in a different cardboard box. Only those who understand that this is a used item are welcome to purchase. Everything in the photos is included. Please let me know if you need it urgently. I will arrange for same-day shipping. No prior contact is necessary before purchase.