By leveraging our extensive market knowledge, we provide the best quality assortment of Oxygen Concentrators Devilbiss. Features: Made in the USA of US and Imported Parts Exclusive DeVilbiss OSD® (Oxygen Sensing Device) standard on every unit — increases accuracy and reliability for longer service intervals Noticeably quiet operation – 15% typical sound quality improvement Readily accessible patient controls and protected cannula fitting Two-year dealer service interval* Recessed humidifier nook prevents damage Easy to assemble/disassemble two-piece cabinet for ease of maintenance Lockable flow meter — Pediatric flow meter available Convenient top and side handles for easy transport Accommodates up to a 50-foot cannula (15.3 meters)