Power over Ethernet refers to a technology that supplies power to network-capable devices via an 8-wire Ethernet cable. The TP-LINK 1-port injector combines power and Ethernet in a single RJ-45 port. You simply need to connect the injector to a power source, plug in the Ethernet cable, and you can already provide a PoE-capable network device on the other side of the TL-POE150S with both power and data. Output voltage: 48 VDC, 15.4 W, including power supply.