1 Pair Power Over Ethernet Passive POE RJ45 Injektor Splitter Adapter Kabel Kit
Since standard Ethernet needs only 2 of the 4 pairs in a CAT-5/6 cable, 2 pairs are unused. Passive POE uses pins 4/5 for plus power, and 7/8 for ground. Specification RJ45 revolution bus, with DC interface.