The Premium Edition Slim Oil Pen is a more sleek and innovated version of the standard Slim Oil Pen. The Kind Pen equipped this pen with many clever features. For instance, it has a 2-click preheat setting. You can adjust the voltage with 3 clicks, thanks to the 180mAh battery. It also has LED lighting, and a 5-click on/off safety feature. There is also a USB charger that is small enough to be conveniently carried wherever you go. The Premium Edition Slim Oil Pen includes a refillable glass cartridge. The cartridge is wickless, and is compatible with all 510 threaded batteries. To top it all off, The Kind Pen offers a lifetime warranty on this concentrate vaporizer.