Welcome to our store! This is a fully automatic battery charger Product size 22*11*7cm Automatic charging prevents battery overcharging. So you can connect the charger to the battery indefinitely. The smart charger works with most battery types, including calcium batteries, AGM gel batteries, wet lead batteries. They can also help restore depleted and sulfated batteries. Battery type: most types of lead-acid batteries, including calcium batteries, AGM gel batteries, wet batteries, lead-acid batteries, etc. Switch mode technology: Yes Polar protection: Yes Short protection - output circuits: Yes Battery Free Link Protection: Yes Overvoltage protection: Yes Overheat protection: Yes Cooling: fan Input voltage: 100 - 240V AC, 50 - 60HZ Rated output: 12V 6a Minimum starting voltage: 8.0v Battery range: 4 - 120ah Thermal protection: 65 + / - 5 Efficacy: application. 85%. Actual quantity shipped: 1 piece(s) Complies with: CE, UKCA, FCC100% Satisfaction - Our customers are our priority. If you find any problems with the products after receiving the goods, such as damage and incorrect quantity, please contact us immediately. We do our best to provide you with satisfactory after-sales service