The Double 510 Cartridge Battery is a versatile and efficient vaping device for CCELL-like and most 510 thread cartridges. With dual cartridge support, you can choose between flavors or mix them. The upper housing is replaceable, eliminating the need for cleaning. Features include preheating, three voltage levels, and a three-level charge indicator. Enjoy vaping by drawing or using the button. Features Unique patented industrial design Supports two cartridges simultaneously (enjoy one flavor, the other, or both together) Compatible with CCELL 10.5mm cartridges (length under 70mm) Replaceable upper housing for customization Draw-activated or button-activated for convenience Battery level display for easy monitoring Preheating function for optimal performance Three adjustable output levels Type-C charging port for fast and efficient charging Multiple safety protections: short circuit, over-puffing, and low voltage protection Specifications: Cartridge Resistance: 1.0 ohm ~ 3.0 ohm Supported Cartridges: 0.5ml, 1.0ml, 2.0ml; 510 thread; less than 14.5mm in diameter Sensitivity: ≤ 17.5ml/s Suction Resistance: 300 ~ 600 pa (at 17.5ml/s airflow) Battery Capacity: 400mAh Over-Puffing Time: 8 seconds Preheating: 1.8V, 10 seconds Three Levels of Output: 3.5V, 3.0V, 2.5V Charging Interface: Type-C Charging Time: ≤ 2 hours Product Size: 112mm (height) x 43mm (width) x 24mm (depth) Product Weight: 51.18g