This is a voltage regulator board. It has a terminal strip with a common ground, input, and 5V output. Includes fuse, filter, and power LED. It uses a Dimension Engineering Switching Power Supply for maximum efficiency and isolation.
The Dimension Engineering DE-SWADJ 3 is a larger version of the DE-SWADJ adjustable step down voltage regulator. It can process 3A of current, typical ripple is 25mV and under ideal circumstances the regulator can be up to 96% efficient.
This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 38 V and efficiently reduces it to 5 V. The board measures only 0.7″ × 0.8″, but it allows a typical continuous output current of up to 5 A.