Smart Battery Sense is a wireless battery voltage-and-temperature sensor for Victron MPPT Solar Chargers. The Solar Charger uses these measurements to optimize its charge parameters. The connection between Smart Battery Sense and one or more Solar Charger(s) is wireless: It uses VE.Smart Network - a wireless technology based on Bluetooth Smart. Simple to install & configure, Smart Battery Sense comes with an inline fuse and pre-crimped eyelets. Revealing the selfadhesive tape on the back allows you to mount it directly on the battery.