I have no clue. it says on the website. I don't know a whole lot about these mods but I know that I'm going to get bored of my riva sooner rather than later. Currently obsessing between either picking up a high voltage box mod with juice feeder system, like the Ali'i VV, or getting a big batt high voltage tube mod, like the ProVari or Buzz, and adding a VapeMate to the mix. I think it would be cheaper to go with the box mod, but I am wary of mods in general because of bad experiences with my 5v prodigy and JuiceBox.