It is a DC Buck Converter/Power Supply Module/Voltage Regulator/Adapter, Input Voltage: DC 5~36V, Output Voltage: DC 1.5~33V (0.5V every step) can be slightly adjusted through adjustable resistance, Suitable for DIY an adjustable voltage regulated power supply, Industrial equipment Voltage convert, Power Supply Transformers, Laptop Power Supply, Batteries Buck, Car Power Supply, LED drive,Advertising screen,Monitoring System etc.