Actually it has the RN4081 adaptor. It appears the 4081 is the only atty that can stand up to 6 volts. I'm STILL on the same atty that I've been using for 2 months, on the original cig and the Copper). In my trials the Copper got stuck on, STILL didn't fry the atty! (but wasted the
batteries)
I built a Copper for someone here, I used a 901 atty, worked fine. Sent it to him and he fried 2 atty's immediatly. So I'm not sure if it depends on the quality of the atty or what (my 901 atty worked fine). I just prefer to use the 4081's, they've proven their toughness to me.
I realize most people use other attys, but I only want to sell products that have been proven to me to work. I see to many "other" atty failures.