By combing first class performance, fashion-forward styling and powerful sub-ohm capability, the Cool Fire IV Mod from Innokin has become one of the most popular advanced personal vaporizers on the market today. Compact, intelligent and versatile, this latest model in the Cool Fire series has a maximum power output of 40W, and a recommended resistance range of 0.3Ω and above. A long lasting 2200mAh battery allows for all day vaping, while advanced safety features and protections guarantee piece of mind while you chase massive vapor clouds. The CF4 also boasts battery pass-through technology - meaning you can vape while you charge! In addition, the Cool Fire IV can also be used as a portable power bank, allowing you to charge other electronic devices while you're on-the-go. Available in six distinct colors with a wide range of variable voltage (3.0-7.5V) and wattage (6.0-40W) options, there's no other electronic box mod that can match the Cool Fire IV's level of versatility and eye-catching aesthetics.