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Light Boundary is a flood warning device. There are many potential dangers from flooding. When flood water submerged the roadside ditches, uncovered manholes or ponds, the pedestrians and the cars could fall into the deep water accidentally. Light Boundary is a flood warning device powered by an aqua battery. This device was set along the roadside ditches, manholes or ponds. When flooding occurs, the aqua battery will drive the sensor on and light up LED. Then, Light Boundary will project red light and form a red sideline on the water surface to help people recognize the dangerous area and avoid the accidents.