Battery: Built-in 1000mAh Variable Voltage: 1.8V to 4.2V, Single Click Bottom Button Press and Hold Bottom Button to Speed Up Cycling Through Voltage Cartridge Size: Fits carts up to 14.5mm (Diameter) x 62mm (Height) Up to 2G Cartridges Charging: Type-C Pre-Heat Function: Two Button Click, 8sec Activation: Auto Draw Display: Digital Tube Screen Voltage Level Battery Percent Pre-Heat Indicator Puff Counter To Reset Puff Counter, Click bottom button 3 times, on the third click HOLD DOWN bottom button. Interactive Ambient Tube Lighting Silicone Mouthpiece Silicone Grip for Enclosure Strong Magnetic Closure