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. Product page on our main website: https://www.victronenergy.com/accessories/smart-battery-sense When can I use Smart Battery Sense ...and when should I avoid using it? • Check the VE.Smart Networking compatible products list for compatible Solar Chargers. • Smart Battery Sense is not needed, or allowed, in systems which are already controlled by a Color Control GX or Venus GX, see FAQ Q6 for more info. • Smart Battery Sense is not needed for installations which already have a BMV-712 (battery monitor) with a temperature sensor accessory. • For installations using a BMV-702 together with its optional temperature sensor accessory - for wireless connectivity consider adding a VE.Direct Bluetooth Smart dongle instead of a Smart Battery Sense.