Fresh out of the factory, the Eleaf ROTOR Tank is a full-featured tank built for those looking for a twist. It comes with all the standard bells and whistles - adjustable bottom airflow, slide-lock refill system standard 510 connection, replaceable glass, etc etc.However, there's something that sets it apart. The ROTOR tank features an inbuild propeller and mesh-filter system. The system prevents droplets of molten e-liquid from shooting up the drip tip into your mount. No more spitback!* Please note that the propeller is built into the HW-T coils, and not part of the tank itself.