Ok. So here is the main difference between the provari and most other vv devices. The power is regulated in vv devices by pulse width modulation. What this means is that to drop a voltage down, instead of using a variable resistor and making much heat and wasted energy, the voltage instead is switched on and off very quickly. so if you have a voltage of 5 volts, and want to regulate down to say 2.5, the "switch" would be turning off and on with the off time equaling the on time, effectively cutting power by half. The Provari does this much quicker than most mods, thus a smoother vape. Some other mods do this at a slower rate, which makes a rattlesnake type of vape.