With
variable wattage, you find a nice setting which you prefer and set it, say 7 watts. The MVP's chip remembers this. Then say you change
tanks and its a different resistance coil than the first
tank's. The chip recognizes the change in resistance and makes the calculations/changes needed so that you are still
vaping 7 watts. Set it and forget it.
With
variable voltage, it helps to already know the resistance of the coil. The MVP can measure this by pressing the V (voltage) & P (wattage) buttons simultaneously. Then you use a little first grade math to set the correct voltage level. Say the coil's resistance are 2.0 ohm. Add the number two and the sum will be the voltage. 2 ohm + 2 = 4 volts. Adjust + or - volts for your personal sweet spot.
Ohm's Law for Dummies
With the MVP2, you will be either in VV or VW mode, not both simultaneously. The MVP will remain in whichever mode you last set.