Description: 【Product list】: 10 DC power modules, single size is 43mmx21mmx13mm. 【Material】: Stepping Down Power Supply Module is made of quality PCB circuit board, stable performance, strong, wear resistant, and can be used for a long time. 【Function】: Adjustable Buck Converter can convert the input DC voltages into the required output voltages. More in line with your needs. 【Easy to use】: Buck Converter is simple in design and easy for you to use. Please note that the input and output cannot be reversed when using it. 【Applicable】: Voltages Regulator Module is suitable for electronic equipment maintenance, industrial automation, or other scenarios. Specification: Material: PCB Circuit Board Input Voltages: 3.2v~40v (The Input Voltages Must Be Greater Than The Output Voltages By 1.5v Or Higher, And Cannot Be Boost) Output Voltages: 1.25v~35v (Continuously Adjustable) Load Regulation Rate: Less Than 1% Output Current: 3A (Maximum) Efficiency: 92% (Maximum) In-: Input Positive In+: Input Negative Out+:Output Positive Out-:Output Negative Size Chart: 43mmx21mmx13mm/1.69inchx0.83inchx0.51inch Package Includes: 10  Stepping Down Modules Note: Please allow slightly errors due to manual measurement and different monitors.