Intelligent Digital Display: automatic carousel data display, can show / current / Voltage / Simple power supply: accurate CPU temperature control, intelligent charging, does not require adjustment, automatic charging when the battery is connected to the power supply red positive (+) battery fixing clip black with negative (-) battery fixing clip pure copper with high frequency transformer: powerful and fast charging MULTIPLE PROTECTION: Over voltage protection, reverse connection protection (for positive and negative connection error), short circuit protection, over current protection, over temperature protection, over voltage protection. Scope of application: It is strictly forbidden to charge the lithium battery. Suitable for 12V 4AH-100AH lead acid battery(AGM, GEL, MF, SLA, VRLA), diagnoses and repairs battery problems and extends the battery life of cars, motorcycles, lawn mowers or boats. Voltage detection and of power: connect the battery without connecting the power supply, it is possible to display the remaining battery voltage. Keep track of your battery status and see if you need to recharge. Intelligent charging, automatic shutdown when fully charged, one button repair. Winter and summer mode: The charger automatically detects the outdoor temperature, automatically starts winter and summer mode, and automatically selects the appropriate voltage for the charge according to temperature without adjustment.