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Often referred to as “self-winding,” automatic movements harness energy through the natural motion of the wearer's wrist. Watches with automatic movements are very popular because the wearer doesn't have to worry about winding the watch daily to ensure constant operation.
An automatic watch movement uses a rotor, or metal weight, to power the timepiece. ... Every time the wearer moves their wrist, the rotor spins. That intrinsic spinning motion is transferred into energy that winds the mainspring in the watch automatically. The mainspring is where power is stored.