A watch winder is a device that keeps an automatic watch running automatically. Normally, the watch is always in motion due to your arm movement. However, perhaps you own another valuable watch and only wear it on special occasions. So that this watch does not move when it is "at rest", it is moved by the watch winder - the movement of the arm is simulated. This means that the watch can be worn immediately at any time without having to set anything. You can connect the watch winder to a cable or operate it with 2 x 1.5 volt batteries (not included).
Caution: Inside the safe, the watch winder may only be operated with a battery!