Honda offers an interesting solution for the US market by installing two 12V auxiliary sockets, but limiting the use to one. To do this, this thing needs to be installed, it's basically a jumper with a fuse. For US models only, it is necessary to use this sub harness when installing accessories. It can be mounted in the front or back under the seat, depending on which socket you prefer to use. It provides a connection for the other outlet and has a pre-installed fuse.