Low-cost passive PoE base unit for powering passive PoE devices over Ethernet. Simply connect your power source to the injector, and then use an Ethernet cable to connect the injector to the RouterBOARD device. Helps reduce the number of wires that lead up the tower, and in other situations.For use with RouterBOARDS that support 10-28V PoE powering, the input needs to be at least 18V to accommodate any losses in cables.