At the track that I race at. The track supplies the rechargable transponders to each racer before the race, as is normal. However if you have a personal transp. then you are allowed to sign up with it and race with it. I could ask this weekend and find out what versions of Hardware and Software that they are using if anybody is interested. (providing it does'nt rain) I'll ask too if there are any conflict issues that have occured.