UWELL WHIRL S PEN KIT 1450MAHStealing the show is the feature of the Whirl S Pen Kit. It has a top filling tank with an adjustable bottom airflow ring, and most importantly, the child lock structure of the top cap & coil lock design at the bottom(only CRC version). Inside there is the UN2 Meshed H Coil, which can provide you satisfying and saturated flavor. And the tank and coil are easy to disassemble so you can clean the tank by running water. With a 1450mAh built in battery,