installation steps:
1. Open the top cover of the car body
2. Put on the balloon
3. Pull the balloon out of the round opening of the top cover
4. Put on the body top cover
5. Align the inflation port and install the cart
6.Press the inflation rod down to fill the balloon with the right amount of gas
7. Press the start button and the car starts to sprint
8. The car is launched and the balloon stops when the air is exhausted