Environmentally friendly high- and low-temperature flame-retardant materials ensure safe, durable performance. The holder combines strong mechanical strength with excellent insulation, heat resistance and flame resistance, and it resists fracture, deformation, combustion and short circuits in use. Product uses - Can be wired directly to the electrical line of any vehicle or marine appliance. Examples include car roof lights, car headlights, wide-view lights, fog lights, warning lights, car refrigerators, and car fans. Installation - No pre assembly required. This grounded circuit box holder is easy to install and ready to use. Construction and indicators - The grounded box with a ground bus is crafted from high-quality materials with careful attention to detail for high efficiency and long life. It includes LED light indicators and a robust construction for reliable results.