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This life buoy uses the structure of the rotating shaft to increase the area of the rescue. It breaks the traditional form of a life buoy only can save one person. The life buoy also use powerful magnet adsorption function to make every life buoy linked into lifeline. In case of emergency, the number of people can be rescued at the same time, so this kind of life buoys can reduce the death rate of the victims. The outer membrane of the life buoy is coated with luminous paint in it , the light can provide some location information of the victims, which can make rescuers find these victims easier and save their life timely.