This is the long range version and can be read up to 10 meters away (depending on conditions). The Smart Battery Sense is a wireless battery voltage-and-temperature sensor. Although it is designed specifically for Victron MPPT Solar Chargers it can be used anywhere. The display can be shown on a phone or tablet. It is ideal for out of the way batteries like generator starting batteries or bow thruster batteries. When used with a Victron MPPT Solar Charger the charger uses the measurements to optimize its charge parameters. The accuracy of temperature data will improve battery charging efficiency, and prolong battery life. 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 self-adhesive tape on the back allows you to mount it directly on the battery.