The Victron Battery Monitor (BMV) line is comprised of precise devices used for monitoring batteries. Their primary purpose is to accurately measure ampere hours used and determine the state of charge of a battery. These monitors can be equated to a "fuel gauge" for your battery, and also provide a time-to-go indicator and other useful features. Each model includes a square bezel overlay (for a square gauge appearance instead of round), a securing ring for rear mounting, and screws for front mounting. All models can be installed in a panel with a 52mm (2.0 inch) aperture, or in one of Victron's specialized wall enclosures. A 500A/50mV shunt, fitted with a quick connect PCB is part of every product package. Alternatives shunts are available if required: 1000A-50mV, 2000A-50mV, 6000A-50mV. Each model includes a 10 meter UTP cable with RJ12 connectors and a power supply cable with fuse. BMV battery monitors are compatible with VE.Smart Networking. Note that although the BMV-702, BMV-702 (Black), and BMV-700 do not have Smart Technology built-in, they can all be updated to use it with the optional VE.Direct to Bluetooth Smart dongle. The only downside is that means the VE.Direct communication port is now in use for the dongle, so you cannot connect it to a Victron GX device as well. If you want Victron Smart Technology and GX device connectivity, then select the BMV-712 Smart. If you don’t need the added functionality of the 712 Smart or are on a budget, then choose one of the other models to suit your needs. BMV-712 Smart (6.5 – 95 V, 1 – 9999 Ah, Bluetooth built-in, Auxiliary input) BMV-702 (6.5 – 95 V, 1 – 9999 Ah, Auxiliary input, no Bluetooth built-in) BMV-702 [Black] (6.5 – 95 V, 1 – 9999 Ah, Auxiliary input, no Bluetooth built-in) BMV-700 (6.5 – 95 V, 1 – 9999 Ah, no Bluetooth built-in)