The brand new IPV4 100W Box Mod is the regulated box mod by Pioneer4you. The development of the IPV box mod has come to an apex with all the features that were lacking in the IPV2 & IPV3. Redesigned from scratch and more robust internally than ever before, the IPV4 is a great addition to the IPV collection. The IPV4 features an upgraded Yihi chip with 100w and temperature capabilities. It takes two 18650 batteries and features an all new battery door held in place by ball bearings to make switching batteries much easier. The IPV4 will read resistances down to 0.1 ohms and will automatically calculate the voltage of the circuit as you adjust the wattage.