COMPREHENSIVE BATTERY MONITORING: The Victron Energy BMV-712 Smart Battery Monitor tracks various parameters for battery systems with voltage ranges from 6.5 to 70 VDC ADDITIONAL INPUT: Victron Energy BMV-712 features an additional input which can be programmed to measure battery temperature, midpoint voltage, or voltage of a second battery, plus a relay that can be programmed to control other devices BUILT-IN BLUETOOTH COMMUNICATION: Wirelessly monitor your batteries on smartphones, tablets, and other devices. Or, connect to a GX device via VE.Direct cable (sold separately) and monitor anywhere in the world with VRM WITH DISPLAY: Displays % State of Charge, Voltage, Current, Energy/Time remaining, and more. View historical data and charts in Victron Connect. Easy to Program for initial setup on the display or via bluetooth Incorrect installation can be hazardous, Please consult a licensed professional and follow all applicable electrical codes during installation. Because of the high voltage application, the shunt is housed in a special enclosure