Voopoo X217 Mod is a very beautifully built and well-designed mod that is quite comfortable to hold in the hand. It's a simple oval-shaped symmetrical mod with a front facing screen and a centered 510 connector. Voopoo X217 Mod is a pretty full-featured mod overall. There are Voltage Mode, Watt curve mode (set in 1 second increments for 10 seconds and 5 memory slots), Power mode (watts) and Temp control mode for Ni200, Ti, SS, and Ni80. No TCR mode but the TCR is adjustable in each of the preset modes, although limited to a range. It uses the same TCR system as the other GENE chip mods.