The IEEE 802.3af Power Over Ethernet Injector (10/100/1000Mbps) (Part number: POE-152) from Planet is a Power over Ethernet (PoE). PoE (Power over Ethernet) products transmit both power and data across the internal cores of an Ethernet cable technology, enabling to get power to hard-to-reach areas. Nowadays they are an integral part of homes network setup, helping to remove the need of having other power cables since PoE devices are powered by ethernet cables.
IEEE802.3af PoE Injector - End-Span for Gigabit Ethernet