Part 2SD1411A gives its name to this 217 KB PDF, sorted into schematics though it is almost certainly a component datasheet; the A suffix indicates a variant of the 2SD1411. JIS designation 2SD refers to NPN transistors for low-frequency applications. Technicians rely on such sheets to confirm pin order, voltage and current ceilings and gain, both for meter testing and for picking a stand-in part. Read it with any PDF viewer; the body marking is typically D1411A.
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 @cyberlanelectonik. 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.