Marine Remote Control Y ConnectorUse specifically when using more tha one remote when the remotes are not hooked up in a daisy chain. The WR600Y has a "pig tail" on the back that allows the daisy chaining to occur while the WR100Y remote does not.Enables the connection of multiple Marine Remote Control (MS-WR600) to your 600 Series Marine Stereo. This is required to utilize Fusion"s 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) Product : FUSION MARINE REMOTE Y CABLE WHEN USING 2 OR MORE REMOTES Manufacturer : FUSION Manufacturer Part No : MS-WR600Y UPC : 9416523604020