Compact size with top handle for easy transport and storage. Reliable and safe. High efficiency. Easy-to-read digital hour meter display. Automatic safety shutdown for power surges, high and low pressure, high temperature and low oxygen concentration. Thermal protection to ensure compressor and concentrator safety. The unit comes standard with low flow and oxygen purity indicators. The humidifier bottle and cannula are sold separately. Size: 13 “W x 10.3” D x 21.3 “H Weight: 35.5 lbs Power 360W (average) Consumption: Alarms: Power failure, sensor failure, <73% or ox lasting 10 min. 02 Purity: 93% + – 3% Outlet Pressure: 5.5 PSI + .73 PSI Pressure Relief 36 PSI + 7.3 PSI Mechanism: Maximum 5L. Recommended Flow: Power Supply: AC120V, 60HZ; Current: 3.5A; Power: 450VA. Flow Range in Liters : 0.5-5L / min, 93% + 3% (after running for 30 minutes) Usage: Designed for 24 hour use.¬†Warranty: 3 years.