Imperium BMS connects to the battery management system (BMS) through Bluetooth to read the working status, remaining capacity(SOC), voltage, current, effective capacity, etc. 1. Operating state of the battery: three states of charging, discharging and standing. The blue light is the state of the battery. 2. Remaining battery percentage: displaying the remaining battery percentage allows the user to monitor their battery usage. 3. Voltage, effective capacity,: these are the battery working parameters to better understand the safety of the battery. 4. Technical Support: Enter the provided password for app engineers to provide support.