It compliments the design of Raijin MOD. It has a new air-flow control that gives a new touch for VHO. Compare to Helios, Raiju’s air-flow control can accomodate single coil build. It also has a high-quality insulators to accommodate multiple builds but the height of the insulator is lower compare to Helios to avoid damage every time the user torch their wicks. VHO also lowered the height of the poles and inner chamber to produce better flavour but still gives the vapor production satisfaction. To sum it all up, Raiju RDA is the enhanced feature of Helios.