J-DEAL LM2596 DC-DC Buck Converter Step Down Module Power Supply Output 1.23V-30V (10 Pcs-LM2596) Input: DC 3V to 40V (input voltage must be higher than the output voltage to 1.5v above can not boost) Output: DC 1.5V to 35V voltage continuously adjustable, high-efficiency maximum output current of 3A. Features: All SANYO solid capacitors, the 36u thickening circuit boards, high-Q inductance with output value of high-power LED indicator Dimensions: 45 (L) * 20 (W) * 14 (H) mm (with potentiometer)