Robust & Elegant look.PSA (Pressure Swing Adsorption Technology ) Flow Setting Continuous from 0 LPM to 5 LPM .Oxygen Purity of 93% +/- 3% at 5 LPM Standing Pressure (in kgf/cm2):95, Working Pressure (in kgf/cm2):93 Inbuilt Nebulizer Low & esay maintenance