This product is self-winding automatic mechanical wristwatch. Compared with common quartz movement watch, it can add your classical breath. Since it's automatic mechanical, it would get energy through your movement rather than battery. Generally speaking ,the error of +-45 seconds per day is possible, so you don't worry. In addition, the special function of water resistance and stainlee steel back will give convenience as you needn't take it off when you wash your hands or face(but not for swimming or diving).
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