Made in the USA, the robust DeVilbiss 525DS Compact Oxygen Concentrator offers just the right balance of cool and quiet for home users. The simplified cabinet design allows for 15% typical sound quality improvement and improved system cooling. Innovative Turn-Down Technology helps reduce energy bills while still providing high quality, continuous oxygen flow at settings up to 5 LPM 24-hours-a-day, 365-days-a-year.