Features: _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: 4V-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 (4-35V), 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