An automatic movement works in a very similar way to a hand wound movement. The mainspring releases its energy through the train and escapement over a period of approximately 38-42 hours but the difference between an automatic and hand wound movement is the way in which the automatic movement re-charges itself. An automatic movement uses a rotor which oscillates back and forth when worn on the wrist, providing constant power to the mainspring thus keeping the watch full of energy. Automatic watches provide added convenience by negating the need to wind your watch every day or change the battery every 18-24 months. Nomos Glashütte, Pequignet and many more brands in our stock contain some incredibly well made and reliable automatic movements.