This set of two Phono/RCA Baluns are part of our Modular AV Extender Wall Plate System range that employs balun technology to extend a combination of audio and video signals over low cost Cat.5e/6 cable. Choose from a range of snap in modules, including VGA, RCA/Phono and S-Video combinations designed to be fitted to our single gang face plate or double gang face plate. * Note: Maximum transmission distances will depend on the application and the twisted pair cable used. These products are designed for use with a single network cable connected between the transmitter and the receiver. Video signal quality will vary depending on the length and type of cable used and in some cases may be extended beyond 300m.