The MC-MD 2 is a secondary unit to the MC-1. If you are looking to add a 2nd screen to your MC-1, this is it! Easily connect using the included MC-MD Y Cable and 8 foot extension cable. Additional 8 foot cable (MC MD EXT) available for purchase resulting in a 16 foot possible length. Need more? Connect up to 2 MC-MD 2 units to your media center. Personally customizable to store your favorite sources & favorite audio pre-sets for all 4 zones. Users can set multiple volume levels for a variety of lifestyle environments, then custom label those presets for fingertip access while on the water. Featuring easy connectivity, customizable audio presets, and the ability to extend the length up to 16 feet, the MC-MD 2 is the perfect addition to your MC-1 media center. With the capability to connect up to 2 units and store multiple volume levels and presets for different environments, it provides a convenient and efficient way to enjoy your favorite sources while on the water. Upgrade your media center experience with the MC-MD 2.