Product information:

Core: Highly intelligent embedded CPU chip surface treatment technology: imported epoxy resin covering the shell characteristics; engineering plastic shell, waterproof design.
Suitable for bicycles of 26 inches and above

Packing list:
1. Colorful Hot Wheels
2 instructions
3. Tie
4. Packing box
5.18650 rechargeable battery
6. Battery charger
7. Battery box
8. Sensor
9. Download line