Well it depends how you look at it. If you look at The Chuck, it's a no frills, no electronics, low resistance copper mod with just a basic mechanical activation switch and one wire. An 18650 (3.7v) batt comes off the charger at 4.2 volts, stack a pair of CR123's and you'll be coming off the charger at 7.2V. Go with unprotected CR2's, and it's higher yet. In head to head reviews, comparing it to a fancy higher resistance aluminum mod with multiple switches, mosfets, wires, LEDs etc. The reviewers always seem the comment on how The Chuck vapes better at either 3.7V (seems more like a 5V mod was one comment), or at 6V. Because of it's straight thru, low resistance design it's able to more efficiently use all the power the battery has to offer and maintain a high voltage longer than most of the slick aluminum mods.
Back to your original question this is from PureSmokers site.
Prodigy V2 Breakdown:
* Push Button Mechanical Switch
* Designed to use (2) RCR123a Batteries. Voltage under load is roughly 4.5v - 5.25v
* Completely sealed design. Dripping Friendly.
* All parts (Minus Atomizers/Battery) built from scratch utilizing Stainless Steel/Aluminum/Copper/and Delrin Plastic.