1. Both sides of the small ship use the roller front mode.
2. Just rotate the main spring at the bottom of the boat (about 3-5 turns) after letting go, the boat can advance.
3. Watch power design.
4. More green without batteries.
5. Easily Drain internal moisture.
6. The bottom is designed with leak holes, which can drain the water after leaving the water surface to prevent bacteria from growing.
7. Smooth surface, will not hurt the baby.