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Menstrual period (MC) always brings women discomfort and influences their normal life. Researches indicated that it can help women relieve menstrual cramps and even shorten MC effectively as long as they do some appropriate exercise according to their physical condition. This is a sense bracelet which can help women know their body condition at any time. It has the scale of 24 hours a day. The breathing frequency of the light tells you whether the quantity of exercise is enough or not in a day. The changing color shows the coming of MC. And the purpose of deliberately ignoring the times accuracy is to remind people to slow down the steps in their busy life.