DFX-23B·II portable emergency suction unit adopts AC/DC power supply and battery as standby power supply. It can be applied in suctioning secretions, bloods and other substances that cause blocking in respiratory tract, and may also be used in suctioning required in other surgical operations. It is especially fit for first aid in the outdoor circumstances and on ambulance and where there is no power supply. Where there is power failure from electric grid, the AC/DC will switch automatically to ensure normal use.