The Sentinel system comprises:

Hardware:
Sentinel Monitor - Collects, interprets and stores data from the dual measurement modules and other sensors.

Dual measurement modules - Each module measures the voltage of two batteries
independently, and transmits this to the Sentinel for use.

More about hardware >>

Software:
Link battery management software - The Link software gives the user a simple
interface to the batteries (via the Sentinel), displaying and storing data and alarms.