Victron Energy Smart Battery Sense, Voltage and Temperature Sensor, Long Range (up to 10m)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