Zapper questions?

Hi Guys,

I'm going to be doing the Clark parasite cleanse. But I'm also looking into getting a zapper.

I've been doing research and I can't find the different between the copper handles, the wrist bands and the foot pad. I've looked on Ebay and most of them seem to only have the handles. I'm guessing the wrist band replace the handles? And the the foot pad is a third contact point? But what works best?

I don't want to spend a ton of money but if I have to spend a little bit more to get something that works I would rather do that.

Thanks,