CAT-5 Baluns simplify installations, provide additional flexibility, and reduce costs wherever long cable runs are required. These CAT-5 Baluns also make it possible to expand systems in homes and buildings already wired with CAT-5 cable. Used in pairs, every Niles Balun was designed with a specific application in mind: from sending analog audio to an upstairs bedroom, to sending HDMI signals across the house to the family room.