The IPV400 is one of the smallest dual 18650 mods, coming in at 88mm*41.5mm*28mm. The menu buttons on this mod are placed on the front panel, rather than the side. The placement of the menu buttons on the front panel is intended to help you avoid accidentally changing your memory settings when you go to press the fire button. The fire button on this mod is still located on the side, like most dual 18650 box mods. From the early pictures of the mod, you can tell that they took some design hints from Sigelei on the 213.
Small Size (88mm*41.5mm*28mm)
Reverse Polarity Protection
Temperature Control (Ni, Ti, SS316)
IPV SX Pure Mode
Spring Loaded 510 Connection