This new model has a more streamlined silhouette. The collar that used to hold the threading at the top of the battery is now flush, making it look longer despite only being 1cm taller than the 1.0 version. The flex temp dial on the bottom has also been updated. We lowered the voltage slightly, with a new range from 2.0V to 4.0V. This 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.