This Ubiquiti POE-24-5W adapter is actually a PoE injector for powering PoE devices over the same cable that also transmits data. Thus, you do not have to be limited by the range of the power grid when selecting a location for the PoE network element. You can use the Ubiquiti POE-24-5 W adapter to remotely power selected routers, access points, switches, or antennas. The prerequisite is Fast Ethernet and, most importantly, a device with a PoE Extractor supporting 24 V input voltage.