Home Oxygen Concentrator (Oxygen Concentrator) brand Yuwell 8th generation (model 8F-5AW with a capacity of 5 liters), which is a medical device used to generate oxygen for patients at home. Flow rate: Provides adjustable oxygen flow from 0.5 to 5 liters per minute. Purity percentage: The oxygen concentration in it reaches 93% ± 3%. Features: Equipped with wheels for easy movement and a top handle, in addition to a display screen and a nebulizer feature. The device is almost new, used only twice. I hope not to undervalue the item. The price of the device new in medical centers and pharmacies is 3500﷼.