Introducing The all new Ooze Slim Pen TWIST Battery + Smart USB is a 320 mAh adjustable temperature vaporizer battery that heats when the button is pressed. Twist the dial on the bottom to select a voltage level between 3.3-4.8V. Compatible with 510 thread cartridges. Available in 18 stunning colors, An Ooze pen is the perfect complement to any outfit and makes a great finishing touch.