DROK AC to DC Buck Converter Voltage Regulator Step Down AC 17-26V DC 17-40V 24V to 12V DC Voltage Adjust Module for CCD/CCTV Regulated Power Supply Input Voltage is AC 17-26v or DC 17-40v ( input regardless of positive and negative ) and output is 12V Its output current is 2A max, the total power is 24 Watt with a output interface 5 5mm, inner core 2 1mm Equipped with protection function, short circuit protect, over current protect, over load protect and it has a long service life It is commonly used for ccd camera, CCTV system, gateway and other electronics with 12V It has a good conversion efficiency of 80 percent and its working temperature is -20-60 Celsius degree