The Innokin Cool Fire II is an 18350 mod in the shape of a hand grenade! But what you can't tell from a picture is that it conforms to the shape of your hand extremely well, and may very well be the most comfortable mod we've ever held. The Cool Fire II is variable wattage, which is adjusted with a ring that spins, similar to the iTaste 134. Just turn the ring to choose among 7.0, 8.0, 8.5, 9.0, 9.5, 10.5, 11.0, 12.0 and 12.5 watts. 3 clicks of the firing button will turn the device on or off, and the button lights up different colors to indicate remaining battery life. Green means your battery is over halfway full, yellow means halfway full, and red means under halfway full. A full charge should last the average vaper between half a day and one day. The connection has 510 and eGo threading, and the top ring is removable, allowing you to use any atomizer you'd like. The Cool Fire II is very easy to use, performs extremely well, and feels great in your hand! Comes with an iClear30B clearomizer. Accepts unprotected, flat-top, high-drain 18350 batteries.