smart volt power cords?

[the gnome]

looking to grab a few 20ft power cords for ballasts and I'm seeing
these smart volt cords at the supply sites?
what's the difference with them??

 

[Zarezhu]

good question

"These power cords are compatible with all ballasts that feature Smart Volt power cords. This includes Sun System 1, 6, & Crop Master, Harvest Pro, Harvest Pro Elite, Budget Gro II, Galaxy and Lumatek."

Thats all i was able to find on em