Provides ~4 hours backup at 5 L/M continuous flow for Oxygen Concentrators. Relax with powerful new backup for oxygen concentrators—and more.Batteries fully charge in 10 hours. Size: 24 lbs, 13′′ x 9′′ x 10′′ (L x W x H) No adapters or inverters needed Compatible with all home oxygen concentrators, ventilators, CPAP/BiPap/ASV, and high flow nasal oxygen machines.