The present invention provides an oxygen gas diffusion cathode for sodium chloride electrolysis comprising: a porous conductive substrate comprising silver, a hydrophobic material and a carbon material; a catalyst comprising silver and palladium, coated on the porous conductive substrate. The circuit board includes pin receptacles that receive conductor pins of one or more of the various components to allow the components to be plugged in and frictionally fixed to the circuit board to establish electrical connection. The method includes accessing a table that corresponds with the transaction and adding a signature field having a property sheet to the table.