Bullet Points:   1、In-Vehicle Battery Monitor: The BM2 Blue-tooth Battery Monitor is designed for all 12V batteries. It can perform voltage tests, charge tests, start tests, and trip logs on your vehicle. And the car battery tester uses very little battery power. Just check it before you go out and you won't get into trouble on the road.   2、12V Digital Battery Tester: With Blue-tooth 4.0, the free app Battery Charge Monitor 12V RV connects your battery in milliseconds. Real-time notifications will inform you of accurate voltage readings when the battery level drops. You can conveniently view it on your mobile app.   3、Versatile Battery Analyzer: The Battery Load Monitor is compatible with all 12V batteries, including conventional Overwhelmed, flat, spiral, and gel battery trailers for vehicles, forklifts, hybrids, SUVs, pickups, boats, RVs, motorcycles, travel, and even solar systems.   4、Small and Convenient: The Blue-tooth voltmeter is very compact and won't take up too much space for you. And you don't have to press any annoying buttons to check your data. You just attach it to the battery, go back to your seat and check your phone. Please note that you should be in range.   5、Safe Car Battery Tester: Reverse polarity protection design and fireproof material can keep you safe. The device will automatically monitor your vehicle's battery, starting and charging systems. Get one now and monitor the battery health yourself It is the perfect Valentine's Day gift for family and friends.   Advanced features：   Installed in the car battery via mobile app for real-time monitoring   (Free app for iOS and Android)   List the time of each drive   Compatible with all 12 volt car batteries    Check charging and starting (alternator) system   Automatic engine start detection   Receive battery status notifications when entering Blue-tooth range   Displays voltage and charging information. No need to open the app when the user is near the vehicle   Automatic synchronization when entering Blue-tooth range    Data is stored in the battery monitor for up to 35 days if not synchronized   Alerts phone if some data is abnormal   Checks the starting (starter) system every time the engine starts   Checks starting voltage every hundredth of a second when the engine is started   Graphical view of historical data   Short circuit and reverse connection protection      Notes：   Alerts user if charges are low   View charging history in graph mode   Real-time battery charge status display   Near-Filed Perception automatically gets notifications   App Name: Battery Monitor BM2   One app can manage multiple cars   (Dear friends, when you purchase this order, please check your mobile app store or Android Market to see if this product APP is available.)   Support: All 12V car batteries    Available: Android 4.3 and higher    for IOS: IOS 7.1 and later   for iPh: 4s and newer   for iP: iP ad 3 and later   English language   Connectivity: Blue-tooth   Packing list：   1*Car battery diagnostic instrument