A brief 37.5 KB PDF identified only by the part number 2SC5710. JIS numbering assigns 2SC to NPN bipolar transistors, so this is likely a concise datasheet. Without more information in the name, treat it as a reference for pinout and key ratings. Technicians use such sheets to confirm which lead is which before diode-testing junctions and to choose a substitute with adequate breakdown voltage. Small files may lack curves, so verify critical specs elsewhere if needed.
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.