Not a damn thing. It's basically the primary side of a transformer and the "reciever" is the secondary. It's old tech now, I can't remember who first patened it but I think it was GE. I even saw a comercial for it during a baseball game tonight. I thought it was really cool when I first saw it, but now
A C-note says I can build one with stuff I have around the house.
Jeff
The Warnings & Cautions discussed in this manual cant cover all possible conditions/situations. It must be understood that common sense and caution are factors which cant be built into this product.