The is two products in one. First, it's the Bluetooth accessory for the Victron Energy range of inverter/chargers â Multi, MultiPlus, MultiPlus-II, MultiGrid, MultiGrid-II, Quattro, and our Phoenix Inverters with a VE. Bus port. When installed, this dongle uses 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. 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. It also adds Instant Readout to the VE. Bus product and displays the inverter/charger's key data on the VictronConnect device list page without requiring a connection to the product. This includes visual notifications of warnings, alarms, and errors, allowing for at-a-glance diagnostics. Also works as a voltage and temperature-sense device for the inverter/charger Great alternative in caravans, smaller yachts, and motor homes Adds instant readout to the V.E. Bus product | Victron Energy VE. Bus Smart Dongle