Passive 4 CH Video Balun Concentrator Passive four channel network cable video  repeater (Cat.5:500m,more use for receiver,pair,central current supply ,just need input 1 channel 12V or 24V DC power,instead of 4 pcs transformer,Saves the power source and the space. Long-distance power supply:Each PCSRJ-45 connection may provide 12V or 24V the DC power supplies through the twisted pair cable to the camera. Provides a PCSRJ-45 interface ,uses in a twisted pair cable transmitting 4 channel video signals