1This is a great DC to DC step-up power supply module for electric equipment, digital products, etc 2Input and output are designed with screw terminals for convenient wire connection and disconnection 3There is a heat sink on board that would ensure a better heat dissipation 4Designed with USB and 2.5A large current output, can identify resistance and charge several phones at same time 5It can also be used as a power supply for laptops or voltage regulator for solar panelsFeatures: _x000D_This is a great DC to DC step-up power supply module for electric equipment, digital products, etc. _x000D_Input and output are designed with screw terminals for convenient wire connection and disconnection. _x000D_There is a heat sink on board that would make sure a better heat dissipation. _x000D_Designed with USB and 2.5A large current output, can identify resistance and charge several phones at same time._x000D__x000D_It can also be used as a power supply for laptops or voltage regulator for solar panels. _x000D__x000D__x000D_Specifications: _x000D_Input Voltage: 3V-35V_x000D_Output Voltage: 5V-45V_x000D_Input Current: 5A(Peak) _x000D_Voltage Display Range: 5V-30V(if input voltage is lower than 4.5V, it will not display) _x000D_Voltage Display Error: /-0.1V _x000D_Size: 72*48*16mm / 2.83*1.89*0.63" _x000D__x000D__x000D_Note: _x000D_1, This is a boost module so output voltage should be higher than input voltage. _x000D_2, Peak output current is less than 5A. _x000D_3, This kit requires professional knowledge and ability, please make sure you know how to use it. _x000D__x000D__x000D_Instruction:_x000D_1. Connect the module to power supply (4.5-40V), the input indicator light is on, and module is working normally._x000D_2. Adjust the blue potentiometer knob (generally turn clockwise to step up and turn counterclockwise to step down) and check the output voltage with a multimeter until it meets requirement._x000D_3.If the output voltage of the module can not be adjusted, which means it is equal to the input voltage, please turn the potentiometer counter-clockwise for several circles then the voltage can be adjusted normally._x000D__x000D__x000D__x000D_Package Includes: _x000D_1 x Boost Module