Zen-O portable oxygen concentrator is designed to aid with people that happen to be suffering from respiratory Issues such as Serious obstructive disorder (COPD), to raised regulate their oxygen therapy on the go. See more You can also purchase a Accredited pre-owned (rebuilt to benchmarks and analyzed) portable oxygen concentrator https://home-security24556.muzwiki.com/6026172/indicators_on_oxlife_independence_portable_oxygen_concentrator_you_should_know