This tool works to remap the stock ECU units on nearly all fuel injected KX250F and KX450 models. I’ve used it a few times and it works great, I’m just upgrading to a Vortex ECU and don’t need this anymore. Comes with the case, unit, charger, cables, and instructions. I can also help you develop maps if you need. New retail is $800, and this one has always been stored in the case and used minimally. Let me know if you have any questions!