Inogen One G5 Portable Oxygen Concentrator offers 24/7 oxygen service. This compact, lightweight concentrator is easy to take with you where ever you go. It weighs less than 6-1/2 pounds with the carry bag and the single-size battery. It powers from three separate sources—AC, DC, and battery. This O2 machine works with your car, boat, or RV. It is auto-sensing for AC power with an operating range of 100 to 240 VAC at 50 to 60 Hz. Take it with you on vacations, and it will adapt to most power sources. Select between a 5-hour battery (setting 2) or double that time to 10-hours with a double size battery. Stay out and enjoy life rather than being tethered to an oxygen tank that limits your mobility.