The Yocan UNI Portable Box Mod is the answer to your cartridge vape problems. The UNI is designed to fit all sizes of oil cartridges so you don't need to worry if it will fit or not. The unit accepts diameters up to 12mm and has adjustable height. The 650mAh battery will keep the user going all day and the level window lets you see how much product is left at a glance. Other features include 10 second preheat mode, magnetic 510 threading, adjustable voltage settings, and pass-through charging.