The Cool Fire IV is the newest and most compact, intelligent and powerful vaporizer from Innokin Technology. Our teams of expert engineers and designers have packed the Cool Fire 4 with the most advanced integrated vaping technologies to create the perfect compact Sub Ohm E-cigarette. With 40W of vaping power, the CoolFire IV fires a full range of tank resistances and each is made with the highest quality materials to create a vaporizer that you can rely on! The compact power, bright OLED display, long lasting battery capacity and easy to use menu system makes the Innokin CoolFire IV the ultimate compact vaporizer for 2015. The CoolFire IV vapes perfectly with the Innokin iSub Apex & iSub-G Sub Ohm tanks.