Automatic

The automatic watch is the upgraded version of a mechanical watch movement. Instead of having people manually wind the spring on a watch and probably damage it, the inventors came up with one that does so automatically.
By the use of a weighed gear and ball bearings to wind the spring, the automatic watch harvests energy from the natural movements of the wearer. Automatic watches are popular among watch enthusiasts for their aesthetic value. The fact that most of the incredibly fine gears are crafted by hand is a turn on for those with a beauty eye.