... natural cooling; 8). Energy efficiency accordingly: ERP/ CEC-V standard; 9). Safety standards: IEC/EN/UL60950; 10).Meet ROHS standards; ... No undertension on chargers. 3,Heat Dissipation:Designed by standard pure aluminum sheet, good heat cunducting,low temperature,high ... with Overvoltage Protection, Stable Working when input Full Voltage.Standard Transfomer:PQ Style, Full Output,Low Termperature,high ...