Plug-in receiver that apparently allows you to sync the on-board timing functionality of the dash so that it registers automatically when you cross a preset point rather than having to press the high-beam flash. I have no idea how to set this up and don't need it. It came already mounted on a 2017 RSV4 RR I purchased. https://www.baysideperformance.com/17-19-aprilia-rsv4-starlane-gps-receiver I believe this is the proper manual: https://www.starlane.com/ftp/manuali/GPS_Receiver_RSV4.pdf $125 shipped