Unipolar Spliter Cable
Expand the amount of Unipolar electrodes your power box can use at one time by using the two into one 3.5mm Jack Splitter.
Most standard electrode pads are unipolar, so you put them on either end of a muscle, or wherever you want the current to travel, and it conducts the power between them (like from one battery to another when jump-starting a car). Two unipolar electrodes occupy one channel of a powerbox. You can't pair a unipolar electrode with a bipolar electrode on one channel. But you can use a channel splitter "Y" cable, and use 3 or 4 unipolar electrodes on one channel.