The Victron Energy VE.Bus Smart Dongle with Bluetooth is two products in one:
This is the bluetooth accessory for the range of Victron inverter/chargers (i.e. Multis, MultiPlus, MultiPlus-II, MultiGrid, MultiGrid-II, Quattros, and the series of Phoenix Inverters with a VE.Bus port). When installed, use the VictronConnect app to monitor operation and also operate the system: change the input current limit as well as switch between Off, On and Charger-only modes.
Secondly it can work as a Voltage- and Temperature-sense device for the inverter/charger. This works with all models, and is especially useful in combination with the MultiPlus-II, as it does not have on-board terminals for Voltage- and Temperature sense wiring
For monitoring, the device is a great alternative in caravans, smaller yachts and motor homes for which the Color Control GX or Venus GX are a step too far..