... protection,over temperature protection.3. High energy efficiency,average efficiency accord ... High reliability,long life,MTBF:100,000hrs(full load,25°C,Mil-HDBD-217F)5. certificates:CE,CB,UL,GS,SAA ... ,ROHS ect6.Portable and low leakage current, low audio noise.7.Tolerance lightning ability is high ... universal switching power supply for electronics with 60Hz frequency,output 12w max and UL,FCC, ...