3A/25A/75A battery charger & maintainer; Automatically selects charge rate & adjusts from rapid charge to trickle charge to maximize battery life; 75A patented engine start to jump-start a vehicle in 90 sec; Alternator check indicates potential alternator issues; Battery reconditioning technology helps reverse sulfate buildup on battery plates to improve charging carrying capability & extend battery life; LCD screen with easy-to-read icons; Reverse-polarity protection; Includes heavy-duty cables, metal clamps & user manual;