Enables the connection of multiple Marine Remote Control (MS-WR600) to your 600 Series Marine Stereo.Required to utilise Fusions multi-zone technology when installing Wired Remotes in each of your audio zones Compatible with the following models of Marine Stereo Unit Marine Stereo for iPod (MS-IP600) Marine CD Stereo (MS-CD600) Marine DVD Stereo (MS-AV600)