DeVilbliss (Drive) 5L Oxygen Concentrator, American oxygen concentrator, almost new with its box, unused. This device is a medical oxygen concentrator from the DeVilbiss brand, specifically model 525PS with a capacity of 5 liters. Usage: Used to provide additional oxygen to patients suffering from respiratory diseases, strokes, and heart diseases. Specifications: Features 15% quieter operation and lower operating cost compared to previous models, with an oxygen flow rate of 5 liters per minute. Manufacturing: The device is made in the United States of America.