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This situation that people go out without room key always occurred,especially when the person living alone, forgetting to take out keys become even moretrouble. So we design the zipper that can accept key. In peacetime, we can put the key into the zipper , this is equivalent to carry a spare key in the body when we wear clothes with zippers. The key will be closely stuck in the zipper and will not bring out other hidden problems of insecurity. Avoiding the trouble situations that go out without your keys.