If you've found a must-have electrode but it isn't compatible with your ElectraStim stimulator then you'll need an adapter kit to make it fit. This 2-pack of adapters fit onto your existing ElectraStim cable to transform the 2mm pins into 4mm press studs. You'll be able to transform a single channel on your stimulator with this pack. If you have a dual-channel stimulator then you'll need to buy an adapter set for each channel. No wires are included as these were supplied with your original purchase.