ITEM NAME:LM2596S DC 4.0~40 To 1.25-37V Adjustable Power Supply Module Digital Display Description: Input Voltage: 4V-40V (40 v to limit the highest voltage); Output Voltage: 1.25V-37V (decompression mode, input output must be greater than 2 V above). Output current: 2 A continuous output. Output power: the maximum 15w. Short-circuit protection (14A MAX) combined with over-temperature protection (Automatically shut off the output once over temperature), safe and reliable. Led Digital Voltmeter Tube, The Accuracy Is Adjustable Function, Can Be Aimed At Your Multimeter Adjustable Accurate. Press the key "S1" to let the display show the input or output voltage. when the green led light, it shows output, the red show input. Suitable for DIY of storage battery, power transformer, adjustable voltage regulator, 24V power supply, LED lights power supplies, industrial equipment step-down etc. and other work requirements. 12V to 3.3V, 12V to 5V, 24V to 5V, 24V to 12V and so on. Specification: Material: Plastic Size: 65x35mm/2.56x1.38inch Package Includes: 1 Piece LM2596 Power Module SKU: DMO0013459273017323.When the green led light, it shows output, the red show input. Output current: 2 A continuous output. Output power: the maximum 15w. 1 Piece LM2596 Power Module. 12V to 3.3V, 12V to 5V, 24V to 5V, 24V to 12V and so on.