The upgraded version of the Reuleaux box mod, the RX2 20700, is compatible with both 20700 and 18650 cells. The RX2 20700 has a huge 1.3-inch display and an easy-to-use interface, and it can fire up to 200W with twin interchangeable cells. In terms of look and performance, the GNOME atomizer, which features powerful WM coils for optimal flavor and a retractable top design for easy filling, is a perfect match for the RX2 20700. To use the EU edition, first unplug the mouthpiece, then press the top cap down. Slowly pour the liquid into the tank through the hole. After filled, close the hole with the top cap.