Features This is a high-quality DC to DC boost power module. The design of the heat sink provides better heat dissipation. It can identify resistance and charge multiple mobile phones at the same time, and can also be used as a power supply for notebook computers or a voltage regulator for solar panels. The input and output have screw terminals for easy wiring and disconnection. Using USB and 2.5A high current output. Features: This is a high-quality DC to DC boost power module. The design of the heat sink provides better heat dissipation. It can identify resistance and charge multiple mobile phones at the same time, and can also be used as a power supply for notebook computers or a voltage regulator for solar panels. The input and output have screw terminals for easy wiring and disconnection. Using USB and 2.5A high current output. Specifications: Input Voltage: 3V-35V Output Voltage: 5V-45V Input Current: 5A(Maximum current) Voltage Display Range: 5V-30V(if input voltage is lower than 4.5V, it will not display) Voltage Display Error: +/-0.1V Size: 72*48*16mm / 2.83*1.89*0.63" Note: 1, This is a boost module so output voltage should be higher than input voltage. 2, Maximum output current is less than 5A. 3, This kit requires professional knowledge and ability, please make sure you know how to use it. Instruction: 1. Connect the module to power supply (4.5-40V), the input indicator light is on, and module is working normally. 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. 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. Package Includes: 1 x Boost Module Package List 1 x Boost Module