Quick Fix: The red LED indicator will immediately light up when the corresponding fuse is blown. The WUPP Automotive fuse block will indicate exactly where there is a short circuit or other fault so you can easily identify and change it! 【MAKE WIRING CLEAN】 – Instead of piling up a mess of wires and fuse holders on your battery terminals, the WUPP 12 Volt Fuse Block/Ground Bus Kit gives you 12 dedicated fuses and 12 ground locations to keep all your wires clean, organized and accessible. Make electronic wiring in your vehicles or boat a breeze! Safe Material: Made of environmentally friendly PBT material, the WUPP 12V fuse block meets all the standards of an ideal fuse box. It is mechanically strong, insulated, heat-resistant and flame-resistant. There will be virtually no problem like producing fracture, deformation, combustion or short circuit phenomenon Universal Protection: Whether you are building a massive land lighting setup or adding electric windows to your classic. WUPP fuse