Yocan UNI Pro Box Mod is the upgraded version of Yocan UNI that features universal compatibility with cartridges of all sizes. The UNI Pro built-in with height slide matching all styles of oil atomizers, don't have to worry the atomizer is too tall or too short, the UNI Pro will let you adjust the height to any oil atomizers. The UNI Pro Mod is powered by an internal 650mAh battery with variable voltage and an OLED display for a stable vaping experience. The 10s warm-up feature warms up your oils before first use. In short, Yocan UNI Pro Box Mod is the best choice for those looking for professional performance at a reasonable price! Yocan UNI Pro Features: Integrated 650mAh Rechargeable Battery Voltage Output Range: 2.0-4.2V 3 Power Levels 10s Preheating Function Zinc-Alloy Chassis Construction Two Adjustment Buttons OLED Display Screen Patented Adjustable Atomizer Height/Diameter Settings Magnetic 510 Threaded Adapter LED Battery Life Indicator Light Juice Viewing Window MicroUSB Port