1,Constant Voltage 2,Output: 50W,12V 3,Certification: CE,RoHS 4, ... 50/60HzInput Current 0.5A(Max)Output Voltage 12V Output Current 4.2AOutput Power 50WRipple and Noise ≤80Mv at full ... efficiency.3. With short-circuit and overload protection.4.Power adapters with overvoltage protection, short circuit protection, overload ... of product or repaired bad product. 12V 4.2A laptop charger, laptop power supply