Weighing only 19 kg (42 lbs), the 10 liter oxygen concentrator is one of the smallest, most compact high-volume concentrators on the market, perfect for patients who require more than 5 lpm of oxygen. equipped with exclusive devilbiss oxygen sensing device (osd®) for monitoring oxygen produced, this concentrator helps to ensure user safety and product reliability. capable of delivering up to 96% of o2 purity from 2 to 10 lpm equipped with accessible patient controls, bright leds that can be seen from a distance, protected cannula fitting and recessed humidifier nook to prevent damage transfill caddy (sold separately) with 18 x 14 inch shelf connects easily to 10l concentrator.made in usa