A watch winder is a device designed to keep automatic watches wound when they are not being worn. These watches rely on the movement of the wearer's wrist to wind the mainspring, which powers the watch. If left unworn for an extended period, an automatic watch can stop, requiring manual winding or resetting. Watch winders come in various styles and sizes, accommodating one or multiple watches. They simulate the motion of a wrist by rotating the watch in different directions and speeds. This helps maintain the watch's accuracy and keeps the lubricants inside the movement evenly distributed.