The Victron Energy SmartShunt is an all-in-one battery monitor, only without a display. Your phone acts as the display. The SmartShunt connects via Bluetooth to the VictronConnect app on your phone (or tablet), and you can conveniently read out all monitored battery parameters, like state of charge, time to go, historical information, and much more. Alternatively, the SmartShunt can be connected and read by a GX device. Connection to the SmartShunt is made via a VE. Direct cable. The SmartShunt is a good alternative for a BMV battery monitor, especially for systems where battery monitoring is needed but less wiring and clutter is wanted. The SmartShunt is equipped with Bluetooth, a VE. Direct port, and a connection that can be used for monitoring a second battery, midpoint monitoring, or a temperature sensor. Can also be connected to a GX device via a VE. Direct cable (sold separately) Connection for monitoring a second battery, midpoint, or temperature sensor | Expion360 Victron Energy SmartShunt 500A/50MV in Blue