OxyGo Portable Concentrator with 16 cell Battery. Includes (PN 1400-1000-16): AC Power Supply, DC Power Supply. 16 Cell Battery and Carry Bag. 39 decibel noise level (at setting 2). 5 year warranty, sieve beds and battery 1 year warranty. Pulse Flow Settings 1-5. Weighs 6 lbs, Double Cell Battery duration 8.5 hours (at setting 2).