1 minute to start a car from 50% discharged. 1 hours to fully charge from 50% discharged. Alternator voltage check, (Good/Bad Indicator - 5 Sec). Digital Display shows charge rate, operating mode, fault codes and FUL when charged. Short circuit and reverse polarity protection (No Spark) for user. Built in reconditioning (Desulfate). Three stage automatic rapid charging. Internal short circuit protection. Compensates for low AC from extension cord use. Microprocessor control (Digital Smart Control). High frequency power conversion technology. Cables and clamps self stored. Reverse polarity indicator.