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Our design across the time This a barrier for the blind We designed the product for the problem, we use the ball. The magnet. Hours timer to achieve his running, every hour, hour timer will issue instructions, magnet will release a ball, a ball will roll to center triangle, every hour, center triangle will increase a ball, until 12 ball gather together. Every hour, every magnet adsorption of ball will in turn back (center triangle have booster). The user can according to the number of the position of ，the ball and to determine time, peripheral circuit ball rolling, rolling one every minute, display a minute.