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The athlete and judge often need to determine the validity of a hit, especially when the falling position is beside the borderline. It is hard to determine quickly and exactly. A red line of 15cm is considered to be set around the tennis courts, which is made of electronic sensor. At the same time, there is an electronic element embedded at the center of the tennis. If the tennis enters the region of the red line, the whole sensing region is lighted to inform invalidity to players and judges. This will improve the efficiency of the game.