The A9 Rebuildable Dripping Atomizer (RDA for short) is highly recommended to advanced users.
Two distinct features make it different from A6/A7/MINI A7 RDA.1. Adjustable
Airflow System, there is one fixed-size hole on the lower stainless
tube and two holes in different sizes on the upper stainless tube,
adjust two holes' location on upper tube to control the airflow.2. Dual
coil,this A9 RDA comes fully assembled with a 2.4ohm dual coil so it
can produce more vapor and forward ejuice more easily to the heating
part than regular RDA.
The A9 RDA shares some of the same features as the A6/A7/MINI A7 RDA.It features a removable and changeable coil which resistance is easily changed by adjusting the length of coil.You can use most 510/901 style drips tip on A9 RDA.The RDA has a standard 510 conneciton, which can fit most devices with 510 threading like eGo C batteries.