2 click preheat mode. More Power 20 seconds hold time. Adjustable voltage : 3.3 v - 4.8v Press twice to preheat for the extra thick oil Volume: 900 mAh Length: 95mm Diameter: 11.2mm Weight: 22g Voltage: 3.3 v - 4.8v Compatible with any 510 thread cartridge Preheating output: 1.8v