Hello, is the super chip reusable? If reusable, why people cannot buy just a few and then use it.

Answer:

Yes, it is. There is a reset option in the mini key tool.

The chips is just to start the car.

If you fix it for someone, how can you take it back.

You can use it as emergency to drive the car to your garage.

(Thanks to Carl and Andrew and Misaki)