Mini Expandable Circuit & 4 Amp Fuse allows you to easily connect additional 12V accessories to an existing fuse holder without the need for cutting or splicing your vehicle’s existing wiring. The 7/16” wide expandable circuit offers plug and play connectivity and is designed to provide two fuse spots: one for your vehicle’s existing fuse up to 15 Amps, and another for the included 4 Amp fuse.