This on / off switch with power light， internal automatic reset circuit breaker，  internal cooling fan， highly accurate ammeter， highly filtered DC voltage， no AC leakage， no AC pulse power that can overheat fine motors， self regulating output， automatically compensates for load conditions， and no noise interference with other electronics.                                    Features            Universal AC input / full range<br> It's good quality & high performance<br> Full load burn-in test<br> Cooling by free air convection<br> Input: AC110 - 240V  50 / 60Hz<br> Out put: DC 12V 1A<br> Protections: overload / over voltage / short circuit<br>                                                                                                 Package Includes            1 x 12V 1A Switching Power Supply<br>