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Automatic watch. An automatic or self-winding watch is a mechanical watch in which the mainspring is wound automatically as a result of the natural motion of the wearer to provide energy to run the watch, making manual winding unnecessary. A mechanical watch which is neither self-winding nor electrically driven is called a manual watch. Most mechanical watches manufactured today are self-winding.
Modern Rolex watches have a self-winding mechanism that winds the watch when it is in motion. However, if you have not worn your Rolex for several days, the lack of motion will cause it to die. To power a Rolex, you can manually rewind the watch. Unless your Rolex watch has died, you do not have to wind it.