About this item: Waterproof - The fuse and relay box comes with a waterproof and dustproof top cover, bottom cover, waterproof silicone sealing plugs and multi-core cable rubber blocks, multiple waterproof measures ensure the normal use of relays. . Convenient Pre-Wired - This fuse relay box is pre-wired, which finishes half of the connection work and leaves you only the necessary installation processes, makes the connection of this relay fuse box much more convenient and easier for you. Wide Application - The waterproof fuse relay block is designed to provide a reliable and safe environment for the use of equipment and keep the connection system clean. It applies to cars, trucks, boats, etc. 40A Relay - 12v automotive relay box will be equipped with 6 pieces of 40A 4-pin relays, provide the highest rating to make its application wider and safer. Various Size Fuses - Auto fuse block also comes with 6 pieces of ATC/ATO fuses, which include 1 x 5A, 1 x 10A, 1 x 15A, 1 x 20, 1 x 25A and