Universal protection for 12V marine or overland electrical setups: 100 A total capacity, 12 A per circuit up to 30 A, plus a ground bus bar; includes electric device name labels to quickly identify which appliance is drawing power. LED warning indicator: Red LED lights indicate when a fuse is blown; the waterproof fuse block shows exactly which circuit has a fault, making it safe and easy to inspect and the blown fuse. Safe fuse box construction: Made from environmentally friendly PBT; meets marine fuse box standards; mechanically strong, insulated, and heat resistant with low risk of deformation, combustion, or short circuits. Wire organization: 12 dedicated fuses and 12 ground locations to keep wiring clean and organized; prevents clutter at battery posts and simplifies wiring of electronics in boats or vehicles. Use scenarios: On a boat to power navigation lights, bilge pump, and radio or fish finder. On an overland vehicle to support roofmounted lights, fridge, and inverter. In classic vehicles to organize added auxiliary electronics.