I am pretty sure that is a 3.7V mod. The higher mah means that it will hold its charge longer.
The Dual Coil Cartomizers have two coils instead of one so you get warmer vapor and less burning of the filling materialThe flavor is better because the heat from the coils is spread out over a larger surface area. I really love the dual coils
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I agree that the Dual Coils provide warmer vapor and I use them some myself. The downside is they don't last nearly as long as regular cartos in my experience.