electronic rust control units

Hey all,

For the first time ever today, I seen a car that had this little box thing with a flashing light, that apparently is connected to the body somehow, and then to the battery, and apparently keeps your car from rusting???

I asked a few questions and they sell these things out of the business office at new car dealerships(immediatley I thought "money grab") anyone have any experience with these things?

can they work?

how do they connect to the body??
Author: admin