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In China, there are thousands of people get injured by or died of the disappeared manhole-covers, and three-quarter of them are children.The missing manhole-covers have become an invisible killer in the city.The Cover-The-Hole is actually a “LED tape” with a range sensor, which uses the green lights to woven into a virtual net, building mental obstacle in the passers-by`s mind.And red ones to form a red fences, warning people not to get close.Besides, if there is a flood and the manhole-cover has been washed away, the red led lights can also pass through the water and warn the surrounding people.