Experience innovation and power right in the palm of your hand with the Nova Sphere. This sleek, compact 510 thread battery features a stunning dynamic 3D curved screen and stepless voltage control, giving you smooth, precise hits every time. Features Stepless Voltage Adjustment: 1.8V–4.2V for precise control Dynamic 3D Curved Screen with 3 selectable patterns (change with 3 clicks) Battery Capacity: 500mAh Pocket-Friendly Size: 29.5 × 22.5 × 57 mm Compatible with all 510 thread cartridges (top connector) Efficient Preheat Function for optimal performance Advanced Overload & Short Circuit Protection Fast Charging via Type-C port