βResqmed Oxygen Concentrator 6 Litreβ, described as a βrolling model.β ( Imported from Turkey ) Specs listed there: Oxygen concentration: 93% Β± 3% Power: 230 V, 50 Hz Sound level: ~43 dBA Weight: ~14.4 kg Flow: Upto 6LPM It with in-built nebulizer with Oxygen Purity Percentage Display deliver 0.5β6L/min of oxygen flow. Oxygen purity is often around 93 Β±3% a few percent. Safety features usually include alarms for low purity, low pressure, power failure, etc.