Home oxygen concentrator from the leading company Yuwell, model 7F-5, known for its durability and availability of spare parts. Specifications and Features: Oxygen Flow: Adjustable up to 5 liters/minute. Additional Function: Includes a built-in outlet for a nebulizer. Counter: Total operating hours 8323 hours. Technical Condition: The device is operating with high efficiency. The device is clean and well-maintained. Ease of Movement: Equipped with wheels and a top handle for easy movement around the house.