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Apparently, people have such problem while using public toilet: they cannot find out vacant rooms rapidly after entering toilet. Instead, they must come close to observe or pull the door to make a decision. This not only waste time but also disturb people in the room. Prompter is an innovation which will make the process of finding vacant room becoming accurate, efficient and evading disturbing others. It will help people, especially people have color blindness or intelligence defects, find out the vacant toilets by the contrast of handles between vacant and occupied rooms. As handle of occupied room is retracted, user will not be disturbed.