Instantly upgrade your current network switch to PoE. This PoE injector extends 48v Power over Ethernet up to 328 feet via ethernet cable. A passive PoE injector always delivers the same voltage as its power source. Power PoE Splitters, IP security cameras, VoIP desktop phones, WiFi access points, or other low voltage 802.3af devices through a network data cable using this passive Power over Ethernet adapter / single port injector.