Expansion HubNMEA 2000Shore Power, Fire & Theft monitoringTwo additional battery banksA second bank of bilge pumpsSee it all on your phone!Alerts, history, and NMEA 2000 dataSimply connect what you want to monitor to the Expansion Hub, and it’ll all appear automatically on our simple to use app! Check fluids, battery levels, engine hours, and more… anytime, anywhere!The Expansion Hub Connects EasilyAttaches with only one cord to your Boat MonitorThe Boat Monitor is the system’s brain and communication hub. Simply connect to the Expansion Hub with the provided cable and you’ll be up and running!