The eVic is the first e-cigarette with user upgradeable firmware. It accepts 510, eGo, eGo-T, eGo-C atomizers as well as tank systems such as Kanger and Viva Nova. The eVic only weighs 4.1 ounces with the battery installed and, measuring roughly 4.8 inches long by .9 inches wide, it fits comfortably in your hand. Both the voltage and wattage are adjustable, 3-5 volts and 5-11 watts, respectively. The Joyetech eVic electronic cigarette utilizes a single 18650 battery cell and is compatible with most 18650 batteries. It has a built in USB charging port that doubles as a connection to your computer that allows you to track your usage through the JoyeTech MyVaporRecord Software (Window XP/7 only).