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When the flood occurs, a product called "Floating Elves" can effectively alert people to avoid deep-water areas, especially the low-lying sections of the city, using the principle of water pressure triggering and laser devices to protect the lives and property safety.
It is a public utility product that alerts people to avoid deep water, when the external water pressure reaches a certain value.The thin film at the bottom will be triggered and connect the circuit to emit a laser. Meanwhile, as there is gas space inside the product, it will float on the water immediately after triggering. This product can be applied to the inside of speed bumps
Ningbo Institude of technology, Zhejiang University