Battery Monitor BM2 BM2 is a kind of auto battery monitoring for all 12V car batteries, woks via Bluetooth and mobile phone APP, to check the battery status and relative systems in the cars . Works with all 12V batteries. Wireless (Bluetooth 4.0) in10 meter Software included for Android and iPhone All Apps for Android and iPhone are designed by ourselves, download for free via Internet Functions Receives notifications of battery conditions in Bluetooth range. Checks vehicle cranking system automatically while engine is starting. Checks charging system (alternator) Lists the time of each driving. Alerts mobile phone if detects abnormal data. Short-circuit and reverse connection protection. Data stored in battery monitor up to 35 days if out of sync. Automatic synchronization when in Bluetooth range. Compatible with all 12V vehicle batteries. Shows historical data graphically. Engine starting detection automatically. Free app for iOS and Android. Support mobiles: All iOS and Android smart phone with Bluetooth 4.0 iOS (iPhone 4S,5, 5C, 5S and later;iPad 2,iPad Air,iPad mini,iPad mini 2 and later) Android: at least Android 4.3 (support for Bluetooth 4.0 phones) Vehicle Coverage All 12V batteries, including motorcycle, car, SUVs, MPVs, light trucks, trucks, and boats. Including the Lead-Acid, AGM, GEL, EPB, Lithium metal batteries.