Hidden Danger Detector / Hidden Danger Detector

Taiwan is world ranked third of mortality rate of drowning, and river is the highest mortality area. The surface of the river looks calm, but there always have some hidden dangers under water, it is undercurrent. Under current is cause by the irregular bottom of river, its power is very strong sometime, people might die. Mostly, the people who drowned know how to swim. They drowned, because they didn’t know how danger is it. They ignore the dangers, so they drowned. Therefore, I want to design a product that can let people know how danger is the river since they are a child, and let them notice the dangers immediately at the same time.