Rechargeable Timer: The watch shaker can be set to shut down at a timer of 1-8 hours, with a built in battery, it can be used for more than ten days, and two speeds are adjustable Performance: The mechanical watch winds automatically, simulating the walking posture and normal exercise state Note: it must be a mechanical watch with automatic winding function Safety: Do not worry about the watch being magnetized, as long as it is more than 5cm away from the magnetic field, it is safe enough Description: Two Modes: Swing left and right, swing back and forth