The POE-INJ-LED-S has 2 LED indicators. One LED indicates that DC power is being supplied to the inserter. The other LED will light up when a device is plugged in at the far end of the CAT5 cable and that device is drawing current. Operates up to 24V POE. It uses shielded connectors and cat5 cable for ultimate protection. 10/100 Ethernet Compatible. POE Injectors are used to inject DC Power to a CAT5 cable in order to power remote equipment using power over Ethernet. They combine the data and DC power on a single CAT5 cable. The power is injected on pins 4,5 and 7,8 of the CAT5 cable by connecting a DC power supply to the 5.5/2.1mm DC Jack. The remaining pins carry the data. The POE Injectors are shielded connectors and cable.