The iTaste VV 3.0 is the smallest variable wattage or regulated wattage e-cigarette on the market (to my knowledge at the time of writing this at least.) This little e-cig packs a heck of a punch with it's 800mAh internal battery that you can charge while using the e-cigarette - pass-through for the win! It has a variable voltage and wattage function - ohm checker. It has a full eGo connection so you can use it with your favorite tanks - and a bright LED screen to display useful information. A lot of performance for so little a price!