Design concept: first, rotate the rotatable ring at the lower part of the bottle cap, and turn to your favorite pattern through the visual window. This pattern can be Arabic numerals, or small animals with simple strokes. There are a certain amount of patterns in a box of water, and the background colors are different. Through combination, the probability of repetition is reduced. When consumers choose a good pattern, they can open the bottle cap. With the leaving of the bottle cap, it will drive a small mechanism to fix the outer ring, so that the rotating ring with the pattern can not rotate and keep the pattern fixed (this operation is irreversible, that is, other people can't change it). Consumers can normally open the bottle cap after they have finished drinking, without affecting the next opening. Application shows that: in our life, often can appear at the meeting at a party or his has been open and drinking water bottle, is not take wrong by others, so the design concept of the difference between a bottle with others then arises at the historic moment, at the same time there are difference in China's beverage market bottle beverage category can drink bottles are numbered. The application of this bottle cap beverage bottles in parties or other situations can make consumers pick up the bottle and recognize the marked bottle of water in a short time, effectively avoiding the confusion of bottled water waste caused by the same packaging and to a certain extent to ensure their own food safety problems.