DROK DC-DC 3.5-28V to 1.25-26V LM2596 & LM2577 Boost Buck Voltage Converter Volt Regulator Power Supply Module Small size (523815mm), portable and easy to install Clockwise to raise the output voltage, counterclockwise to reduce the output voltage Using LM2596S and LM2577S ICs, you can raises voltage or reduces voltage as needed, stable and effective Wide input voltage range:3.5-28V; Output voltage range:1.25-26V(continuously adjustable); Max input/output current:3A Ideal choice for DIY solar panel, car/motorcycle battery charging