The Inogen One G3 & G4 Portable Oxygen Concentrator is only compatible with this DC Power Cord. With the help of the DC wire, you can charge your concentrator using any typical DC Power Outlet, including those that are used in boats, and other vehicles. As long as there is enough power, the Inogen One G3, G4 or G5 will function normally when connected to DC Power. Remember to always charge the battery that is currently connected to the concentrator.