Pre-wired - This fuse relay box is pre-wired design, completing half of the connection work, makes the entire connection process faster and time-saving. Capacity - This fuse and relay box can max hold 4 relays and 12 fuses at the same time, making multiple relays in one box, keeps your circuit neat and tidy. New Installation Design - The front mounting design can safely install the relay fuse box anywhere. 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 is applicable to cars, trucks, ships, etc. 40A Relay - This relay box 12v automotive will be equipped with 4 pieces of 5 pin 40A relays, provide the highest rating to make its application wider and safer. Various Size Fuses - This auto fuse block will also come with 12 pieces of ATC/ATO fuses, which includes 3 x 10A, 3 x 20A, 3 x 25A, and 3 x 30A blade fuses, can meet a wide range of using requirements. Relay Type: 40A Relay Fuse Type: ATC & ATO Fuse Way: 4 Way Voltage: 12V Product Shape: Insert Type Colour:Black Material:ABS Package Contents: 1set x Automotive fuse relay box Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.