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This is a cup made of two kind of material, ceramic and rubber.The Green button on the side of the cup is rubber.When the water above the button, the rubber part will plump up so that the blind can apperceive the water line with touching the prominent rubber button. With the help of this cup,the blind will know the amount of water in some situations such as pouring water,without seeing any thing.
Wang Qi, Wang Guanyun, Wang Yanan