Watch Winder Guide
A quality watch winder will keep your automatic wrist-watch running if you are not wearing it every day. Automatic wrist-watches or self-winding mechanical wrist-watches use the motion of your wrist while the watch is being worn to automatically wind the mainspring and keep the watch running. You cannot overwind an automatic wrist-watch because they are equipped with a device that disengages the winding mechanism once the mainspring is fully wound.
If you do not wear an automatic watch every day most models will stop running within about 48 hours. It is a nuisance to have to reset the time and date every time you want to wear one of your automatic wrist-watch! The simplest solution for those who own a number of different watches including self-winding automatics is to use watch winders.