Our goal was to create the product that will provide Comfort, Quality and Performance, all in one. Our super reliable built-in battery with 510 threaded connections fit all standard atomizer tanks and cartridges. Our long lasting powerful 400mAh Lithium Ion Battery assures consistent variable voltage temperatures adjusted from a manual knob giving you a wide range of choices. Traditional design conceals easily in the palm of your hand. A USB charger is included for your convenience.