This is an adjustable AC DC power module regulated power supply. It uses a LM2596HV voltage regulator chip and can handle input voltages from AC 5V to 30V or DC 5V to 50V. The output voltage can be adjusted in the range of 3.3V to 33V. It has a large current capacity and is designed for convenient use with silk-screened terminal names on both sides of the PCB board.