NMEA 2000 Compatibility KitThis NMEA 2000 Kit allows Polk's Ultra Marine Certified P1 and PA4A to be seamlessly added to your boat's onboard NMEA 2000 network, enabling control and two-way communication from your boat's Garmin and Raymarine Chartplotter/Fish Finder Multi-Function Display (MFD) device.Control functions include source selection, playback functions, volume up/down and more. Two-way communication between the Polk P1 and PA4A and your MFD also allows the display of source selection, song/track/album title (no album art), radio frequency and more to display on the MFD interface.Comaptable With:Polk PA4A receiverPolk P1 Marine receiversIn the Box:NMEA2000 interface module12" NMEA 2000 cable11" Y-adapter cable*Sold as an IndividualWARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to >P65Warnings.ca.gov.