A watch winder is a device designed to keep automatic watches wound when they are not being worn. Automatic watches rely on the movement of the wearer's wrist to wind the mainspring, which powers the watch. When left stationary for extended periods, these watches can stop running, requiring manual winding or resetting. Watch winders come in various styles and sizes, often featuring compartments for multiple watches. They simulate the motion of a wrist, ensuring that the watch remains fully wound and ready to wear. This is particularly useful for collectors of luxury timepieces, such as those from brands like Rolex or Omega.