... in china PS-303 AC to DC Switching Power Supplyhigh stability, high effeciency,dual indication, for ... shorting protection PS-303D+ AC to DC Switching Power Supplyhigh stability, high effeciency,dual indication, for V ... want a half current, press down the button.Power supply inputThere is a button at the back ... want a half current, press down the button.Power supply inputThere is a button at the back ...