I not even sure how the darn thing works because with the Futaba Buddy Box you have power off, but with JR you have to have it on. Does that mean you have to have the futaba buddy box on to buddy with a JR? To confusing for me. Just PM your address sometime and I will drop the cord in the mail to you. Use it as long as you like, and when you get done training your buddy you can just drop it back in the mail to me, or just tell me you lost it. It really not that important to me. Just one of those things I bought, just to buy. You have probally seen them before but here is the photo of it. It has a little chip board inline. That must be what makes them compatible. Anyway, you are welcome to it Gary.