BTW200 is a wireless battery & electrical system tester controlled by DHC’s applications. It also comes with an automatic battery monitor and saves the results into the built-in calendar. Furthermore, BTW200 supports the DHC cloud data management service as well. Features: 1. Battery Monitor Real-time battery monitoring and sends out notification automatically. 2. Battery, Cranking, & Charging system tester 12V battery / 12V START-STOP battery test / 12V & 24V cranking/charging