Small & Lightweight The small, lightweight, low-maintenance system that provides continuous flow. Oxygen therapy consistent with the accepted Standard of Care Auto Recharge Power Cartridge The internal auto-recharge power cartridge enables easy movement between AC power outlets without interruption of oxygen therapy. Long lengths of tangled oxygen tubing are no longer needed to move about the house Travel-Friendly The eclipse mean extended travel w/o the fear of running out of oxygen. Just plug the Eclipse into your auto accessory (lighter) outlet and go as far and as long as you like Long Lasting Power In between an AC or DC power outlet? Not a Problem! The internal auto-recharge power cartridge keeps the oxygen flowing for up to 4.4 hours.