This kind of oxygen concentrator can be used for home, club, hospital...and so on! Oxygen flow (L/min): 1~3, 1~4, 1~5Oxygen purity (%): ≥90%Oxygen delivery pressure (Mpa): 0.04~0.05 Noise dB (A): ≤47~50 dpSize (mm): 438 (Height) *208 (width) *480 (depth) Net weight (kg): 21, 22, 23.5Power: 220V/50HZPower consumption: 300W, 400W, 450W,