THanks for the info, do they sell the flash unit itself? I do not want to waste the money buy the flash unit and find out it does not working with my maxisys ^^ I talk to the tech in the auto store where they sell these autel maxisys, and the guy keep saying i have to buy both flash unit and the maxisys in pair, they go together in pair, something to do with the series numbers, you can not use the flash unit on different maxisys. Well, look like he doesn't know what he talking about.