About this item Conventional Constant Voltage Output BOOST Fully Integrated Solutions, Integrated MOSFET, Fewer External Components, Smaller Cos System 5A Current DC to DC Adjustable Boost Power Supply Board Module Adjust the blue knob of the potentiometer (counterclockwise general impulse, buck clockwise rotation) and use a multimeter to monitor the output voltage reaches the required voltage Built-in over temperature protection, full set overcurrent protection circuit reliability, high reliability Input and Output must be connected correctly Size: 4.29 x 2.48 x 0.51 inches