Thank you for viewing! Instant purchase is welcome, and I will carefully package your item. Thank you for your support. This product achieves cleaning, movement, rotation, and fall prevention using only one motor and a gear combination. It moves around endlessly on a desk. Within a size that can be grasped with one hand, analog mechanics are packed tightly. A physical sensor on the front of the main unit changes the direction of the wheels' rotation, and a cleverly designed timer mechanism returns it to its original movement. Assemble while checking the gear combinations. Even a seemingly complex mechanism is not difficult, as the assembly instructions are carefully explained with illustrations. Furthermore, by setting the gears yourself, you can assemble while understanding the mechanism. A guidebook is included to further deepen your understanding. The included guidebook explains in detail the basics of gears, the role of the gears used in the kit, and how they relate to the movements. By understanding the secrets of the movement, watching the robot vacuum cleaner's movements will become even more enjoyable.