431017 1， SMD double circuit board， reliable quality， stable output voltage， no-load and rated value change is less than 10V， high conversion efficiency. 2，It will alarm and protect automatically when the input voltage is too low and too high. 3， Overload protection， short circuit protection. 4.Instant impact 2 times the rated power. 5， The automatic start radiating device when the working temperature is too high.