Sidewinder ESC

I just looked at the page on amain and it says that its compatible, nothing about it being included.

The Sidewinder ESC is ready to run out of the box, but it is completely Castle Link™ compatible too – drivers can use their Castle Link and Windows PC to tune and tweak all their favorite settings such as brake and throttle curves, throttle response, drag brake and many other parameters that add up to an incredible RC driving experience.