Some Slot.It controller models have lead wires terminated with banana plugs which are not widely used in North America. Fortunately it is VERY EASY to convert the banana plugs to alligator clips which can then be used with commercial style 3 post hookups. There are two (2) versions of the kit - the only difference is the alligator clips. One kit uses copper alligator clips for the best electrical connectivity possible. The second kit uses more economical steel alligator clips. The "seam" on the alligator clips is pre-soldered for you to ensure the connection between the alligator clips and banana plugs on the controller's lead wires do not loosen over time. This is NOT a permanent conversion - simply slip the protective boots and alligator clips off to use the banana plugs.