Movement Type: 21 Jewels Automatic Mechanical Movement (Self-winding mechanism powered entirely by the natural motion of your wrist; no battery required).Vibrations/Hour: Typically operates at 21,600 bph for smooth second-hand sweeping.Power Reserve: Approximately 36 to 40 hours when fully wound or worn actively throughout the day.Dial Layout: Multi-functional display featuring:Open-heart skeleton window at the 10 o'clock position (exposing the balance wheel).