Features:1.Input Voltage:90~270V，45~65HZ2.Output Voltage: 13.8V3.Rated Charging Range: 12V 28AH-63AH battery4.Connect the battery terminals. Red to Battery Positive ( + ) Black to Battery Negitive ( - )5.The display will become framed in Red with green bars When the battery is fully charged， all the green bars will be illuminated. The charger enters floating mode.6.Our charger has anti-access Protection.overload protection，Circuit protection. It uses pulsed High frequency direct current.7.Input cable:83cm8.Outpur cable: 33cm9.Charging time:4~6hours(Don't exceed 24hours continueous charging time)10.Packing: Retail color box.Attention:1. we will supply a free power adapter for you ，Ensure you can use the charger in your country，if you need it ，pls leave a message to us.