PDF datasheet of 42.8 KB for the 2SA1011 transistor, catalogued in the schematic category though it is really component reference data. The 2SA prefix in the Japanese JIS system marks a PNP bipolar device. Inside you should find ratings, electrical characteristics and the package outline with lead layout. These details help when checking a part with a multimeter, confirming its orientation on the PCB and matching a replacement. Always compare the fitted component marking with this document beforehand.
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.