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Even though blind people can use braille to tell which floor button to reach when riding an elevator, they can not tell if the floor they are stopping on is the floor they want to go to when the elevator is reaching multiple floors. In this case, the design can be a good solution to this problem: the elevator button will be originally a button in two, the Braille area is set as a button, he blind touch the braille press the upper part of the button, at the same time the elevator arrived at the corresponding floor, the sound “Di”announcement issued by the significantly increased to remind the blind to arrive at the floor.