Main Features: 1.Receive notification of battery conditions when enter Bluetooth range 2.Check vehicle cranking system automatically while engine is starting: 3.Check starting system and charging system (alternator) : 4.List the time of each driving: 5.Short-circuit and reverse connection protection: 6.Data stored in device up to 35days if out of sync: 7.Compatible with all 12-volt vehicle batteries: 8.Review voltage history in graph mode: 9.Engine starting detect automatically: 10.Free app for iOS & Android users: 11.APP Name: Battery Monitor BM2 Available: Android 4.3 and later, IOS 7.1 and Later, iPhone 4S and later, iPad3 and later: 12.Built in Short-Circuit Protection: : 13.Built in Reverse Connection Protection: Alerts/Notifications: 1.Receive notification of battery conditions when enter BLE range 2.Review charge history in graph mode 3.Alert users if charge is low 4.Alert on mobile phone if some data abnormal Useful for 1.DIY users 2.Garage /workshops 3.Car service stations 4.Battery service station Specification: 1.Average current: 1mA 2.Voltage accuracy: 0.02 Volts 3.Input voltage: 6-20V 4.Bluetooth name: Battery Monitor 5.Physical dimensions: 5.5*3.581.5cm 6.Bluetooth: 4.0 7.Operation Temperature: -40°C -85°C 8.App Keyword: BM2