SMAKN Adjustable 4.0-40v to 1.25-37v 5/12v Dc Lm2596 Voltage Regulator Experimental Power Buck Converter+led Voltmeter Module Model:LM2596 Buck Converter+Voltmeter Input Voltage: DC 4.0~40V Output Voltage: 1.25V~37V Output Current: 2A(normal and stable), 3A Max. Display Color: Red