12V Battery Monitor Voltage Tester with Low Charge Alert for Car RV Marine Solar System Load Diagnostic Tool Features： 1、Features: Receive notification of battery conditions when enter BLE range, check starting system and charging system, list the time of each driving, review voltage history in graph mode. 2、Function: Check battery state on phone APP via Bluetooth 4.0 when device is installed, supports for iOS and for Android users, which has high efficiency and accuracy. 3、Easy Operation: The battery monitor can connect with battery directly, with no code required, compatible with all 12V vehicle batteries, with 6‑20V voltage. 4、Practical: Ensure safe operation with short circuit and reverse connection protection, and it's ultra low power consumption, with average current of 1.0 mA. 5、Alert: Alert mobile phone if some data abnormal, and has the function of low battery, viewing charge history, and displaying the charging status of the battery. Specification： Item Type: Battery Monitor Material: ABS 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; 6.Short circuit and reverse connection protection 7.Data stored in device up to 35 days if out of sync 8.Ultra low power consumption, 1.0 mA average current 9.Connect with battery directly, no code 10.Free app for iOS and Android users 12. Temperature: -40-90°C Function: Check battery state on phone APP via Bluetooth 4.0 when device is installed Application: For all 12V Vehicle Battery APP Name: Battery Monitor Available: For Android: 4.3 and later For IOS Phone: 4S and later For IOS Tablet Inform: Alert users if charge is low Review charge history in graph mode Show the state of charge of battery in real time Near Filed Perception to get notification automatically Fitment: Suitable for  DIY users, battery service station, garage, workshop, tool store, vehicle and battery manufacturer Package List： 1 x Battery Monitor 1 x Manual