The Inogen One G2 is an oxygen concentrator suitable for overnight use. It is an quiet unit with an output of no more than 38 decibels. It has a 24 cell battery pack that can last eight hours. This unit has a very sensitive oxygen conserver that will deliver the pulse of oxygen needed regardless of breath rate changes while you sleep. You should check with your doctor, however, before using pulse flow oxygen while you sleep.
Inogen G2 overnight use is not recommended for patients who require pulse dose oxygen delivery.