The Ooze Slim Twist 2.0 has a sturdier feel that has more weight in your hand, and immediately tells you it’s a quality device. This new model has a more streamlined silhouette. The new voltage range from 2.0V to 4.0V allows hits more of a sweet spot with oil cartridges that are notorious for burnt coils. Each voltage level on the dial is now a notch that clicks into place, so you know exactly how hot the device is heating at any given moment. The Twist Slim Pen features pulse wave technology, or buzzing feedback that tells you when the battery powers on and off, and when the cartridge has made a connection with the device. Click the button 5x to turn on and off and click 2x to activate Prep Mode. Compatible with 510 thread cartridges.