The Caliburn Kit has an internal battery of 520mAh, holds up to 2ml of juice and has a top-filling method design. It also has a draw-activation setting as well as the traditional button in case one fails. There is also a 5-Click Child safety lock and a magnetic bottom of the catridges for easy installation. Perfect for beginners who are transitioning from cigarettes, super light weight and pocket-sized perfect for on-the-go.