... Technology Specs MODELHFBC1205HFBC1208HFBC1210HFBC1215HFBC1220HFBC1230HFBC2415 Charge current (Max)5A8A10A15A20A30A15A Charging voltage12v24VDC AC Input Voltage110V, 220V AC Input frequency45-65HZ Efficiency70%--90% (based on load ... polarity protection for input Charging stageThree step-- constant current, constant voltage, floating charge DisplayLED indicator for On battery capacity Carton size ...