The iPV4-S by Pioneer4You is one of the sleekest dual 18650 box mods on the market, which give it more power and less time to charge! And its software can also be changed! In comparison of the IPV4 and the IPV3, it comes close for having the identical size but the IPV4 is slimmer and has a new grip look to it! The max wattage on the unit is 120w starting at 0.1 ohm. It uses sx 330 v3c chip. With the update, you can control your temperature heating.