Hilitchi 2Pcs LM2596 DC-DC Buck Converter and XL6009 DC-DC Boost Converter Set (Buck Converter 1.23V-30V, Boost Converter 3-32V) Buck Converter Model: LM2596; Boost Converter Model: XL6009 Buck Converter Input: DC 3V - 40V; (input voltage must be higher than the output voltage to 1.5v above can not boost) Buck Converter Output: DC 1.5V - 35V voltage continuously adjustable, high-efficiency maximum output current of 3A. Boost Converter Input: DC 3V - 32V; Input Current : 4A Boost Converter Output : DC 5-35V;