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* Input: 100-240VAC,50/60Hz,1.5A,Output: 42V 2A Power Max: 84W. Model Number: HK-42-2000. * Output interface： Female DC interface（outside diameter of 5.5 mm; inner diameter of 2.1 mm). * 42V 2A, red light means charging, green light means charge full or disconnect * Four Protection design: 1,Short circuit protection; 2,Battery polarity error. protection; 3, Over current protection; 4,Overvoltage protection. * US Power cord included. * Charger is only suitable for 36V batteries and not for 24V batteries or lower. * Charger Plug Size:5.5mm(0.21in)x2.1mm(0.08in)x10mm(0.39in). * Before purchasing, please check whether the charger plug is suitable. * If charging is finished, please pull the charger plug out. * If the charger is damaged during transportation or use, please do not use it. * Make sure the charger is in good condition and check whether the batteries to be charged are in good condition or not.