I checked their website and here is the info I found on this Tank/RDA http://www.ijoycig.com/product/item-313.html
Limitless classic edition RDTA is best option everything is included basically the same thing but has RDA base , pre made coil , an coils , 1 is a postless deck , its how they should of made it in the first place ,
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Maybe try the Taifun Gt v3 , single coil super easy to build wick , nice Flavourful vapes , not airy can be shut down restricted or wide open, i have several of themLimitless Classic is versatile and easy to build on. For me, everything else about this thing is a Con. Can't build the postless in its own base because the screws are inaccessible. The threading throughout is rough. Airflow is turbulent and way too airy. I tried a number of builds and airflow configs - never got a thick, satisfying, flavorful vapor. The flavor is lackluster with both the RDTA and RDA. Gave it away.