In the rest of the medical industry, it's call a TENS unit, and it's used for pain relief. But, slap a purple cover on that shit, flower it up a little bit, and you've got a female orgasm machine!
The Slightest Touch is, from what I can tell, a lower power TENS unit. Hook a pad an each ankle, and you've basically completed a circuit with your crotch in the middle. All the nerves between go tinglytinglytingly, including the sometimes hard to reach orgasmy ones.
We'll be doing more with electrostim at some point, assuming I can ever figure out how to safely to tell a bunch of random people on the internet to shock the shit out of themselves.