DeVilbiss - 5 Liter Stationary (525DS) 5 Liter Stationary (525DS) Designed for home use; quiet operation (48 dBA); energy-efficient. Flow: 0.5–5 LPM Weight: 36 lbs (16.3 kg) Purity: 93%–96%. FDA approved device. Made in USA 2 Years of warranty. Professionally sterilized for next patient usage. Package contains : Oxygen Concentrator machine Humidifier bottle Nasal prongs Power cable. Call for more information. Price negotiable