What is a Watch Winder?

What is a Watch Winder?

Have you ever heard about an automatic watch winder? Watch winders are a tool meant for automatic watches. An automatic watch itself is a mechanical watch whose power source is generated automatically by the rotation of the rotor. The rotor will rotate if the watch is shaken either intentionally or unintentionally when the owner wears it. Rotor rotation will make the mainspring or spring tighten.