The screen LCD displays the progress of charging status in all directions at a glance. Output current 6V 2A 12V2A/6A 24V 3A lead-acid battery/start-stop battery (do not use lithium battery). Over-voltage / over-temperature / over-charge / short-circuit / reverse connection / over-current / low-current protection. Easy to use and operate. Indication light status: red light turns green light after full charge.