http://m.youtube.com/watch?v=V5KWyHhb3Z8 This is a good video to explain vv/vw like said above the mvp is a great device goes to 5 volts 11 watts and that will cover all standard coils for a tank I would go with a iclear 30s for a top coil and that will give you a warmer vape and a kanger protank 2 that is a bottom coil if you want a cooler vape new toys are always fun if you dont like the box mod look another good one is the itaste vv 3.0 it is the same as a mvp but its only 800 mah compared to 2600 of the mvp and the vv is a smaller mod like a ego hope this helps