Hey Vchick, remember to get some LR cartos for them. 2 ohm is about right for me. I tried a 1.7 ohm atty, it tripped the protection circuit. Just plug it into the charger, and it will reset. I just bought 8 of them, for almost the same price. I'm hooking up some of my smoking friends, I think it's a good starter device, and I use one every day myself.