Flow Range: 5L/min Oxygen Concentration: ≥95% Input Power: ≤600VA Maximum Outlet Pressure: 45kPa±4.5kPa Pressure Relief Mechanism Operational at: 250kPa±25kPa Very easy to install and can be done by any family member. The machine has the total running hours which is displayed for tracking usage. Running Time (20-22 hrs) Lightweight - Only 31 Lbs. Low Maintenance. Simpler For Patients To Use And Maintain. Smaller And Sleeker.