Joyetech ESPION Solo mod is featuring a 1.3 inch OLED responsive touchscreen which will provide convenient operation for you. You can click the function button to lock the screen to avoid any touch by mistake. It is powered by a single 21700 battery and it also can work with 18650 battery as well. It is capable of outputting 80W power, providing you with huge vapor production. The magnetic battery cover features push-pull design,convenient to exchange. The ProCore Air tank features 4.5ml liquid capacity. Slide top cap filling design makes refill easier. The ESPION Solo is definitely a masterpiece to mark the 10th anniversary.