VW reads the resistance of the atomizer and the voltage of the battery every time it fires and automatically adjust voltage to give you wattage you dialed in... even if you change out atomizers of different resistances. VV can't do this. VV does no automatic adjustments.
Both VV and VW can be manually adjusted up or down in the same way if the user wants.
In addition, VW will also automatically compensate for aging coils. For example, with cartos the coil resistance can rise a couple of tenths of an ohm with use. You would need to raise voltage manually to adjust for this. VW does it automatically.
VV will adjust the voltage (and therefore the power) in smaller (0.10V) increments than with the 0.50W steps on the sigelei. Myself, 0.50W steps are plenty small. I can't tell any difference with +/- 0.2V.
Both VV and VW can be manually adjusted up or down in the same way if the user wants.
In addition, VW will also automatically compensate for aging coils. For example, with cartos the coil resistance can rise a couple of tenths of an ohm with use. You would need to raise voltage manually to adjust for this. VW does it automatically.
VV will adjust the voltage (and therefore the power) in smaller (0.10V) increments than with the 0.50W steps on the sigelei. Myself, 0.50W steps are plenty small. I can't tell any difference with +/- 0.2V.
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