Wide application The fuse relay box kit is suitable for a variety of vehicles and vessels, including cars, trucks, boats, RVs, automobiles, and ships. It provides a versatile solution for power distribution in many environments. Key features 4 relays and 12 circuits enable you to manage multiple accessories from a single unit. cover is waterproof and dustproof to protect against water splashes, dust, and debris in demanding conditions. Durable construction designed to withstand mobile use and environmental exposure. Ready to use Prewired fuse and relay box allows for direct installation, saving substantial time on wiring and setup. Plugandplay design simplifies the process, making it convenient for immediate use. Size and portability Dimensions: 12.6 cm x 6.5 cm (4.96 in x 2.56 in). Professionalgrade, compact, and portable for easy mounting in tight spaces. Practical use scenarios Automotive applications: distribute power to aftermarket accessories such as lights, audio, or auxiliary devices, reducing wiring complexity. Marine electrical systems: organize and protect circuits for navigation lights, pumps, and other boat electronics in a damp environment. RV and offgrid setups: manage multiple circuits for lighting, water pumps, fridges, and other essentials in a compact package.