The BM2 is safe and Reliable device and tells you everything about the battery: voltage, charge, cranking power, engine starting detect automatically. With an automatic low volt alarm when the Bluetooth range is at 10 meters. Easy to operate using the free app available for download.
The App:
Battery Monitor BLE is an application for car battery monitoring, which can monitor the real-time voltage of the car battery; count the historical voltage of the battery; it can automatically test the battery startup voltage, and support idle and high-speed charging tests. All data is synced to the mobile app via Bluetooth.
• Check battery state on phone APP via Bluetooth 4.0 when device is installed
• Use for all 12V Vehicle Battery
• APP Name: Battery Monitor
• Available: Android: 4.3 and later | iPhone: 4S and later | iPad: iPad3 and later