Profile: US Oxygen Sales LLC specializes in providing oxygen concentrators. We offer portable oxygen concentrators, and rectified oxygen concentrators. Sequal Equinox portable oxygen concentrator is the most advanced battery operated portable concentrator. It has 1 to 9 pulse dose settings and .5 to 3 lpm continuous flow settings, making it the lightest portable with the highest output. The Sequal Equinox also has a voice module, programmable in 8 different languages, giving that extra piece of comfort with audible confirmation of the unit's status. The portable only weighs 12.8 pounds without the battery and only 14 pounds with the battery. This concentrator also has 2 different battery sizes, allowing the user to travel with longer battery life. Sequal Equinox will last 2.7 hours on a setting of 2 lpm continuous flow using the 24 cell battery.