This 12V car diagnostic tool is designed to test the wiring circuit of trucks, caravans, and trailers. It features a compact handheld design, durable construction, and is easy to use. The tool is powered by a 9V battery (not included) and has a voltage of 12V. It is suitable for indicating failures in the wiring on both towing vehicles and trailers/caravans. The package includes 1 x plug socket diagnostic tool.