The Inogen One G4 Oxygen Concentrator at 2.8 pounds is the lightest portable concentrator. Dimensions are 5.9 x 2.7 x 7.2 inches. It has 3 pulsed dose flow settings that delivers 90% pure O2. The battery will last up to 2.7 hours on setting 1 with the included 4 cell battery. It operates over temperatures ranging from 41 to 104 deg F and up to 10,000 ft altitude. The G4 is quiet at only 40 db. It is FAA approved for travel. An AC charger and carry bag with shoulder strap are included. Inogen is the leader in quality portable oxygen concentrators.

The G4 sold new for $2700, so this a deal at only $1299. Please text or message. I am located in the Park City area.