1. switching power supply 2. RoHS,CB,PSE,GS,CE,FCC,SAA approved 3. Output : 4.2v 2a 4. high efficiency InputVoltage range:90-246V(50/60Hz)Efficiency:80% OutputDC Voltage:4.2vRated Current:2ARated Power:8.4W Protection FunctionShort circuit protectionOver current protectionOver voltage protection ReliabilityMTBF no less than 50K hoursBurn-in and life test