Power over Ethernet passive injector. 8 port and nicely labeled. Mounting holes to attach to just about anywhere. Screw terminal block for power. Grounding wings on RJ45 connectors for shielded Cat5 cable shield grounding. Great for DIY. You provide power through the terminal block, or for low power apps, one powered Cat5 on the power side will supply the other 7. Remote power IP Cameras, Microprocessors, Wifi, Apple AirPorts, Micro with GPRS MODEM, Instrumentation, etc. Or just clean up a project by eliminating separate power cables. See DIY PoE Wiki. (Shown with Cat5 cables not included)