A small 77.5 KB PDF datasheet whose name is just the number 70661, which reads like a manufacturer document number rather than a part number, so the component it describes cannot be confirmed without opening it. Datasheets of this type normally contain pinout, electrical characteristics, maximum ratings and package outlines. A technician uses such data to verify pin functions, expected voltages and replacement compatibility. Compare the marking printed on the actual component with the part covered in the document before trusting the figures.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @ic_mosfet_pdf_datasheets. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.