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The technical data as follows:1. Oxygen flow(L / min): 0~3
2. Oxygen concentration: 90%-96%
3. Oxygen pressure: 0.4~0.07Mpa
4. Noise: Less than 45Db
5. Size: 520(Height)x550(Width)x20(Depth)
6. Net weight: 21KG
7. Power consumption: 300W
8. 110V/50Hz and 220V/50Hz are available
