a LED light indicator to quickly identify battery charging status. Spark proof and reverse-polarity protected for safety. No current is sent through until the charger is properly connected. This solar charger is compatible with lithium (LifeP04), lead-acid, flooded, and sealed maintenance-free AGM and gel cell batteries. Includes four suction cups for windshield or window mounting, a cigarette AC power adapter with 18-inch cord reach, a 5-year manufacturer limited warranty, and lifetime customer support.