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This product helps blind people to drink water through the principle of buoy. In life, blind people often don't know the water level of the cup when pouring water, which leads to water overflowing from the cup. This product solves the problem of drinking water for the blind. When water is poured into the cup, the buoy will rise with the water, and the blind person can judge the water level by sensing the position of the buoy, thus avoiding the water from overflowing from the cup. This function is suitable for people with visual and hearing impairment.