Function: - Suitable for all 12V car battery - Fireproof shell and wire - Driving time record - Check starting (cranking) system when each time engine started - Check charging system - Data storage up to 31 days - Protection of short-circuit and reverse connection - Review voltage history in graph mode - State of charge of battery in real time - Near-Filed Perception to get notification automatically - Alert mobilephone when some data abnormal - Alert users if charge is low Specifications: - Size: 55mm x 35mm x 16mm - Weight: 20g - App Name: BM2