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If the maritime perils occur in night, light and sound are quite important for the rescuers to find the drowning people quickly. The whistle ticket is a special ticket with a green folding triangle structure on one corner. It forms into a whistle when being pressed, so as to be used by the drowning person. At the same time, the lighting hole on another corner can also help the rescuer to locate the drowning. This may improve the efficiency and accuracy of the rescue process, so as to save more lives.