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 power supply red positive (+) black battery clip with negative (-) pure copper battery clip 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: It is strictly prohibited 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 battery life of cars, motorcycles, lawn mowers or boats . Voltage and power detection: connect the battery without plugging in 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. Smart 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 charging according to the temperature without adjustment.