When you make the shocker
(two in the pink, one in the stink)and use the thumb as a "free rover" to stimulate other areas of the woman's sensual areas. If executed properly, the hand will form a "C" shape, hence the "C-Clamp".
The shocker is nice but the C-Clamp is better. I gave the old lady one last night and she vibrated worse than a Furby on crack!