NMEA 2000 Compatibility Kit This 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 receiver Polk P1 Marine receivers In the Box: NMEA2000 interface module 12" NMEA 2000 cable 11" 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. Specifications: Type: Parts Box Dimensions: 6"H x 8"W x 9"L WT: 1.55 lbs