Product Features: Easy to install on battery Real-time battery health monitor Real-time display of battery level, temperature, and voltage Automatically test cranking system Automatically test charging system Alert notification for voltage abnormalities via app Supports simultaneous monitoring of up to four batteries Supports multiple device connections and allows monitoring of four devices on the same page Records trip history, cost, and driving habits, which can be exported to an Excel file Automatically records parking positions and provides car search function via navigation Stores and displays historical data; saves test records Device stores historical data for up to 30 days (voltage, charging percentage, and temperature) Saves data every 2 minutes Product Functions: Compatible with all 12V vehicle batteries Installs directly on car battery for real-time monitoring via mobile app Checks starting system (cranking) at each engine start Measures starting voltage every hundredth of a second during engine start Automatically detects engine start and checks charging and starting systems (alternator) Sends battery condition notifications when entering Bluetooth range Sends mobile alerts when abnormal data is detected Displays voltage, charge status, and protection features including short circuit and reverse connection protection App automatically connects when near vehicle without needing to be manually opened View trip timestamps and analyze historical data with graphical charts Package List: BM200 x 1 User Guide x 1