This set of two Phono/RCA Baluns are part of ourModular AV Extender Wall Plate Systemrange that employs balun technology to extend a combination of audio and video signals over low costCat.5e/6 cable. Choose from a range of snap in modules, including VGA, RCA/Phono and S-Video combinations designed to be fitted to oursingle gang face plateordouble 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, and display resolution will vary depending on the length and type of cable used and in some cases will work beyond 50m at lower screen resolutions.