If you need to connect an RJ-45 cable (a.k.a Ethernet) to a board that doesn't have an Ethernet jack - this adapter will come in very handy! No soldering required - Just flick up the little levers and slide in your stranded or solid-core wire. Note that these aren't recommended for high-speed Ethernet traffic, especially long term, for basic power/data distribution, RJ-45's are great!