the world's first universal width and height adjustable box mod that will work with all the oil atomizers. On the side, there is a height adjust button, you don't need to worry if your atomizer is too tall or too short. Besides, on the top of the box mod, there is a diameter adjustment dial, which will fit all kinds of oil atomizers with different diameters. These are the patented designs of Yocan. By the way, powered by a built-in 650mAh battery, the UNI also supports a preheat function that warms up your oils before the first use, which will last for 10 seconds. With an adjustable voltage option with three power levels, you can customize your vaping experience. 5 colors are optional.