1、This is a fully automatic battery charger,automatic charging protects your battery from being overcharged. So you can leave the charger connected to the battery indefinitely. 2、Smart chargers are suitable for most battery types including Calcium, Gel AGM, Wet, lead Acid batteries. They may also help restore drained and sulphated batteries. 3、Types of batteries: Most types of lead acid batteries including Calcium, Gel AGM, Wet, lead Acid, etc.. Features: Microprocessor Control (CPU). This is a fully automatic battery charger,automatic charging protects your battery from being overcharged. So you can leave the charger connected to the battery indefinitely. Smart chargers are suitable for most battery types including Calcium, Gel AGM, Wet, lead Acid batteries. They may also help restore drained and sulphated batteries. Types of batteries: Most types of lead acid batteries including Calcium, Gel AGM, Wet, lead Acid, etc.. Specifications: Switchmode technology: Yes Color: Red/Yellow optional Charger type:AU Polarity conservation: Yes Output short conservation: Yes Non battery link conservation: Yes Over voltage conservation: Yes Over temperature conservation: Yes Cooling: Fan Input voltage: 100-240V AC, 50-60Hz Rated output: 12V 6A Minimum start voltage: 8.0V Battery range: 4-120Ah Thermal protect: 65'C+/-5'C Efficiency: App. 85%. Packing list: 1*Battery Charger 1*Battery Charger