12V Bluetooth Battery Monitor BM2 On Phone APP All Car 6-20V Battery Tester Car Battery Analyzer Test For Android IOS Phone          Battery Monitor BM2  Main Features:               1.Receive notification of battery conditions when enter BLE range            2.Check starting system and charging system (alternator);            3. List the time of each driving;            4.Alert mobile phone if some data abnormal;            5.Review voltage history in graph mode;            6.Short-circuit and reverse connection protection            7.Data stored in device up to 35days if out of sync            8.Ultra-low power consumption, average current: 1.0 mA;            9.Connect with battery directly, no code            10.Free app for iOS & Android users;            11.Compatible with all 12-volt vehicle batteries;            Voltage: 9-16V            12.Temp: -40-85C                          Battery Monitor BM2 Principle:                     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:                  For Android : 4.