5.5x2.1 mm Power over Ethernet injector/splitter pair -- one of each, injector, splitter. These are nice cable-end units for source and device end. One has a female 5.5/2.1mm barrel jack for power injection. The other has a male 5.5/2.1mm barrel plug for powering terminal device. Very convenient. Use the injector with any supply with 3mm barrel plug. Stay within the 70 watt 48 volt limit for PoE safety. For DIY PoE. See "what is PoE" in the FAQ.
