The Flexlight attaches to Vexilar Ultra Packs, Pro Packs and Genz Packs and illuminates the screen when using your flasher at night. The new design features 3 high intensity LEDs which draw little power from the battery. The kit includes a wing nut for attaching the Flexlight to the base unit and two wiring harnesses. The alligator clip wires are for connecting to Ultra packs and the piggy back wires are for connecting to Pro and Genz Packs.