If you want to use your ElectraStim stimulator with electrodes that have banana plug inputs then you'll need this converter kit. These adaptors slide onto the 2 mm pins on your ElectraStim connecting cable to transform them into 4 mm pins. Each set includes 2 adaptors, allowing you to change both pins on a single connecting wire. If you have a dual-channel stimulator you will need to buy an adaptor set for each channel. No wires are included as these were supplied with your ElectraStim stimulator.