Microprocessor Control (CPU). 3-STAGE AUTOMATIC CHARGING: This is a fully automatic battery charger with 3 charge stages. Automatic charging protects your battery from being overcharged. So you can leave the charger connected to the battery indefinitely. 3-stage chargers are suitable for most battery types including Calcium, Gel and AGM, Wet batteries. They may also help restore drained and sulphated batteries. Types of batteries: Most types of lead acid batteries including Calcium, GEL and AGM, Wet,EFB, etc.. Switchmode technology: Yes Polarity protection: Yes Output short protection: Yes Non battery link protection: Yes Over voltage protection: Yes Over temperature protection: Yes Cooling: Fan Input voltage: 100-240V AC, 50-60Hz Rated output: 12V DC, 5-6A Max. Minimum start voltage: 8.0V Battery range: 4-100Ah Thermal protect: 65'C+/-5'C Efficiency: App. 85%. Compliant standards: CB,CE, IEC60335, EN61000, EN55014 Dimension (LWH): 1508560mm Weight: 380g