Usage Tips:BM2 Bluetooth 4.0 Battery Monitor Feature: Support: All 12V Car Battery Available:for Android 4.3 and Later for IOS: IOS 7.1 and Later for : 4s and Later for : 3 and Later Language:Multi Language Connection method:Bluetooth 4.0 App Name: BM2, please scan machine backup or user manual scan code, download software. BM2 Bluetooth 4.0 Battery Monitor Advanced BM2 Bluetooth 4.0 Battery Monitor Advanced Features: Installed in the car battery Real-time Monitoring Through Mobile Phone App. List the time of each drivin Compatible with all 12-volt vehicle batteries Check charging and cranking(alternator) systems Engine starting detect automatically Receive notification of battery conditions when enter Bluetooth range Show voltage and charge . when user is close to the vehicle,no need open app Automatic synchronization when enter Bluetooth range Data stored in battery monitor up to 35 days if out of sync Alert mobile phone if some data abnormal Check starting(cranking) system when each time engine started Check starting voltage each hundredth of a second when engine is starting Review historical data graphically Protection of short-circuit and reverse connection BM2 Bluetooth 4.0 Battery Monitor NOTE: 1. Alert users if charge is low 2. Review charge history in graph mode 3. Show the state of charge of battery in real time 4. Near-Filed Perception to get notification automatically Colour:black Material:ABS Package Contents: 1 x BM2 Battery detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.