iStick i40 Kit is composed of iStick i40 Device and GTL D20 Tank. It is powered by a built-in 2600mAh battery with 40W max. Designed with the optional VV/VW mode, it can better suit your preference. The GTL D20 Tank features 3ml capacity, easy slide-and-fill system, adjustable and precise airflow, plug-and-play coil replacement and magnetic connection. It is compatible with GTL Coil to bring you consistent and enhanced. In addition, it redefines the design to be beautiful and outstanding. It also features the minimalist design and ergonomic shape to be ultra compact and comfortable to grip.