Power injector for devices supporting PoE, over Ethernet. Connect the power source to the injector, and then use the network cable to connect the injector to the RouterBOARD equipment. Helps reduce the number of wires. POE injector is used with RB 133, RB 133C, RB 150, RB 192, RB 230, RB 333, RB 411, RB 411A, RB411AH, RB 433, RB 433AH, RB 450, RB 493, RB 532, RB 532a, RB 600A . Standard plug 2.1mm.