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The bottom of cup is a circular box which is divided into 4parts to hold tea and soluble coffee.Benign sealed box ensures the 1/4 of the box to contact water.For travelers and drivers who drive long distances,the cup can hold 4types beverages when the time is rich so that they don't have to lose time during trip.all you need is to pick up a glass of hot water and rotate the box in the bottom of cup,then you get a cup of beverage.