Don't let your car battery suffer from the damaging effects of disuse or harsh climates.  KONNWEI BK300 can help monitor your battery health, including Voltage, Cranking, Charging system and travel records. Quickly reads data (Accuracy over 99.5%) to determine if the car battery is abnormal and take appropriate measures to protect the battery. KONNWEI BK300 (KONNWEI BKmonitor) compatible with all 6V 12 24V -volt vehicle batteries; Supports Car RVs/Motorcycles/Boats/Cars/Trucks and so on with All 6V 12V 24V Volts Battery. Free app for both iOS & Android,Easy to Operate: Battery Monitor’s.