Printed circuit board - 1 http://www.ebay.com/itm/201983231910 (This particular printed circuit board is from Radioshack and is out of stock and or no longer made as they went out of business.)
Amrex 2"X2" Rubber Pad Electrodes(I used these in the video. It is important to note that the dimensions of 2x2" are the whole pad and the contact area or sponge is smaller.) Amrex Sponge Electrode Adapters(Used to connect to the pads.)