These pens are Cookie brand. They are one of the choices of devices you will need to consume the vape cart. It has its own charger to it that will fit in any USB port to charge. To function this device you will need to know a few things first. You need to preheat the distillate in the cart before it will vape out. To do so you will need to click the button 2 times. You can get more power with a 20 sec hold time. There is an adjustable voltage at the bottom from 3.3V - 4.8V. It is advised for you to find your voltage you can handle by starting lower and then working your way up. You should not be smoking this vape like it is a cigarette hot boxing with a steady long pull. It is suggested to take quick short pulls. You should not get a burn in your throat. This means you are pulling too hard, too much, or the voltage is too high for you and you can just do more short pulls rather then fewer long pulls.