portable oxygen concentrator,oxygen generator The products have passed the FDA certificate in U.S.A,the CE certificate in EU.Apply zeolite molecular sieve as shift,adopt advanced physical theory(PSA) to separate oxygen andnitrogen in air,at the same time filter the bad subtancein air, so as to get pure oxygen for medical use Technical data: Oxygen density: ≥90% Oxygen flux: 1 5L/min Output pressure: 0.04 0.05Mpa Overrunning pressure alarm Noise: ≤55dB(A) Power supply: AC220±22V,50±1HZ Input power: ≤600VA Packing:570x495x800mm N.W.:25.5kg G.W.:39.5kg