This is a Hot-Shot #2 Long Glo-Starter with Battery Charger. This is used to heat glow plugs while starting glow-powered engines.
Designed with every ECX, Vaterra or HPI modeler in mind, this Dynamite® tool kit contains everything you need to tear down and rebuild your ECX, Vaterra or HPI vehicle from top to bottom. You won’t find a more comprehensive tool set out there. And to help