The drive devilbiss 5 liter oxygen concentrator is part of the devilbiss line of reliable, field-proven concentrator models, designed with enhanced quality, durability and simplicity. this 5-liter concentrator is small, quiet and lightweight and comes standard with the devilbiss osd (oxygen sensing device), standard on every unit, ensures patient safety and reliability for longer service intervals. with readily accessible patient controls, protected cannula fitting, and recessed humidifier nook to prevent damage, the 5 liter oxygen concentrator is designed to help simplify use. safety features include audible alarm and visual high/low pressure, low flow, low oxygen, power fail, and oxygen sensing device.made in usa