The Zeus Radian Erection Harness snaps around the base of the cock and balls and around the penis, just like any ordinary cock and ball strap used to hold an erection. The only difference is the rows of metal studs through each strap. When plugged in, those metal studs act as the contact points, passing electricity from one strap to the other, leading up to an intense orgasmic experience.
As a bipolar toy, the Radian Erection Harness is fine all on its own. Just hook it up to your power box and you're good to go.