The Inogen One®G2 is an oxygen system designed to provide unparalleled freedom for the active oxygen user. Its designed for stationary, portable, and travel use, for daytime and nighttime, and its a concentrator that makes its own oxygen, so it never has to be refilled. Independence Thats what oxygen patients really get from the Inogen One®G2. At home and on the go, the Inogen One®G2 achieves the independence that youve been missing - not just for running errands, or short trips out of the house, real independence - true spontaneity. You can now take off on a moments notice, without having to watch the clock or guess how long your oxygen will last. The G2 is not simply a stationary device, not simply a portable one. The G2 is designed to be one device to serve all your needs.