Datasheet for the SM5M2, provided as a 253 KB PDF. The file name gives only the part designation without manufacturer, revision or a description of the device function, which should be confirmed from the document itself. Expect pin or terminal identification, electrical ratings and package drawings useful for in-circuit testing and choosing a replacement. It opens in any PDF viewer. Small components often carry abbreviated marking codes, so check the code table in the sheet against the part on the board before relying on it.
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 @datasheet_technar_org. 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.