Eleaf iPower 5000mAh Box Mod is constructed out of heavy duty aluminum, which makes it very durable for long term use. The chassis retains the ergonomic form factor of Eleaf's structural designs, implementing a curvy body with easy-to-read OLED display, enlarged firing button, and three button adjustment buttons. Powered by a built-in 5000mAh batter, the kit allows a maximum output of 80W, bringing you different vaping experiences with switchable VW/Bypass/Smart/TC(Ni,Ti,SS,TCR) modes. The introduction of Smart Mode ensures an automated setting that caters for user-friendly operation, automatically senses the resistance of the atomizer installed and allows users to set up to 10 output settings. This allows users to control the power output as well as greater tine tuning of experience. With its compact form-factor, massive battery and cutting edge output technology, the Eleaf iPower is one of the most well balanced mods in its class.