The EB45101S2-000U-999 is a part manufactured by Sunon, a company that specializes in cooling systems for electronic products, such as computers and gaming consoles. This particular part is a 40mm square axial fan, which is designed to provide cooling to electronic equipment. It features an open frame, a speed of 2000 RPM, an air flow of 20.20 CFM, and a noise level of 32.2 dBA. It also has a 4-pin connector and uses 1.20 W of power.