Input : 110V/220V, 47-63HZ Specification: DC24V 4Amp Constant Charging Voltage : 29.4V (7s li-ion battery) Constant Charging Current:4A Charging Mode : 3 Stages, CC, CV, Trickle Material: Aluminum alloy with Fan Dimension : 135*90*50mm Net Weight :0.7kg Application : Electric Vehicles & Tools Various Protection: Over-current, Over Voltage, Over Temperature, Short Circuit, and Reverse Polarity. Products can be Customized!