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The life buoy owns anti-shark liquor sealed up inside. As long as you press the red button when you drowns, the sealed-up plastic will be broken and anti-shark liquor comes out, which can protect the faller.
When sea accidents occur, people can only rely on the life buoy to maintain the life and wait for rescue. But it is not easy to be seen by rescuer and maybe attacked by fatal marine animals.
Li Xiang, Zhang Bin, Deng Haowen, Wang Yan