1. Assemble and insert the corresponding groove opening.
2. Manually toggle the date, month, and period through 3 small balls.
3. The magnetic ball and the ring attract each other.
4. Because of the cotton thread, the ball is at a certain fixed point of the fixed air ring, which refers to the month.
5. The small ball that is attracted to the transverse rod points to the date.
Material: ABS plastic + Magnet
Size About: 23cm x 2.5cm
Color: as show