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This is a magic zipper head,is made from metal and discoloration of liquid crystal and transparent membrane.When pressed it get bigger ,in the middle of the gap when using zipper will inevitably encounter all kind of situation ,the following slide cracking or next to the chute,bring very embarassed situation.Gap in the middle of room can better will take out the zipper head,to pull zipper,zipper when the head will return to the original appearance.At the press the zipper inside put a LCD,can fell the pressure and uv blue light.When to click it when fell outside to much ultraviolet light yellow.Bring to life convenient and fun.