Features: Receive notification of battery conditions when enter Bluetooth range Check vehicle cranking system automatically while engine is starting Check charging system(alternator) List the time of each driving Alert mobile phone if some data become abnormal Short-circuit and reverse connection protection Data stored in battery monitor up to 31 days if out of sync Automatic synchronization when enter Bluetooth range Review historical data graphically Free app for both iOS & Android Compatible with all 12-volt vehicle batteries Specifications: Material: Plastics Average current: 1.5mA Voltage accuracy: 0.03V Input voltage: 6~20V Short-circuit protection: built in Reverse connection protection: built in Bluetooth: 4.0 Operating temperature: -40~90 APP keyword: BM2 Available: Android 4.3 and Later IOS: IOS 7.1 and Later Color: Black Size: As the picture Package Included: 1 x Car Battery Monitor