The technical data as follows: 1. Oxygen flow (L / min): 0~3 2. Oxygen concentration: 93%± 3% 3. Oxygen delivery pressure (Mpa): 0.03~0.07 4. Humidifier delivery pressure (Mpa): 0.02± 0.005 5. Noise dB (A): ≤ 50 6. (-W) (atomizer (ml/min): ≥ 0.5) 7. Rated power: 260-400W (AC220V/230V) 8. Net weight (Kg): 20 -40 9. With power failure alarm 10. With timer 11. With remote controller 12. The earliest delivery time will be with 3~5weeks 13. 110V/50Hz and 220V/50Hz are available Power failure alarm: Yes