The SMOK Alien box mod is similar in size, shape, and power output to the Sigelei 213 and the P4U iPV 6/6X mods. They differ in cosmetic designs, regulating chips, display screens, and menu navigation, but all three are more alike than dissimilar overall. The relatively compact, oblong cylindrical shape — essentially a box with curved sides and flat top and a hinged battery door on the flat bottom — is currently popular among Chinese mod makers.
The large OLED display above the rhomboid-shaped adjustment buttons is clear and contains a wealth of information — more than on most mods — but the layout, graphic design, and font sizes make the display seem a little cluttered. The Alien uses a long firing bar on one side that is contoured to the shape of the mod case and triggered by pressing the top of the bar. The firing bar accommodates either thumb or trigger firing and has a short throw, but the push is a bit stiff (more than on SMOK’s H-Priv mod), so the pressure required to activate firing is more than for some button-fired mods.