Get universal compatibility with the Yocan Uni Pro Cartridge Vape. This unit features full adjustment for height and diameter so it can accept any thick oil cartridge. The Pro edition has an OLED display that shows battery level and voltage. Users can quickly adjust voltage (2.0v - 4.2v) with dedicated buttons for increasing and decreasing. Other features include 650mAh battery, micro USB charging and level viewing window. Available in multiple color options.