Sorry I have not responded to anyone, but major problems in the family have kept me busy. Anyway I bought this thing from epuffer.com, don't know the model number, and have given up on it, one battery does not work, and still not getting more than 4 hits, if I leave it for 1/2 and hour it will cool down and then I can go for 4 more, you live and learn. I have ordered a different one the DSE801 and from what I have read should have more luck with that. I want to stop smoking analogues so I really want to make this work. Thank you all for being kind enough to answer.