This pair of single channel passive video baluns will carry video; audio and power over cat5; giving you the ability to utilize straight network cables to connect your cameras. Simply connect the BNC ends to your camera and your recording device or display; connect the DC ends to a Power Supply and the Camera; then connect your network cable through the RJ45 jacks; audio can be transmitted via RCA plugs. Depending on camera power draw; power output; cable size and environment; results will vary. Average conditions allow transmission up to 1;000 ft. On longer runs video quality might be slightly reduced. DC Jacks are 2.1 x 5.5mm