SMAKN&reg; DC-DC High Power 20A Buck Adjustable Step Down Converter DC 10-40V TO 0.8-13V 24V to 12V 5V 250W Input voltage: DC10V-40V 10V enter below the undervoltage protection Output voltage: 0.8V-13V (onboard potentiometer adjustable) Cooling: natural cooling Rated power: 150W (natural cooling) Rated power: 250W (plus fan forced cooling)