Victron Energy Smart Battery Sense is a wireless battery voltage and temperature sensor for Victron Energy MPPT Solar Chargers With voltage and temperature sense in place, batteries will be better charged; improving charging-efficiency and prolonging battery life The connection between Victron Energy Smart Battery Sense and one or more Solar Charger is wireless: It uses VE.Smart Network - a wireless technology based on Bluetooth Smart Information transmitted can be used simultaneously by one, two or more Solar Chargers connected to the same 12V, 24V and 48V battery bank. The Smart Network is set up using the VictronConnect app Installation is simple, quick and tidy. Just connect the unit's two eyelets to your battery terminals and attach the Victron Energy Smart Battery Sense unit directly onto the battery-body using its self-adhesive strip