Small PDF of about 3 KB titled as a DC power supply amperage guide, indexed as a schematic but likely a reference sheet rather than a board diagram. Judging by the title, it covers current ratings for supplies or adapters, which can help when choosing a bench supply current limit or replacement charger. The name gives no device or brand, and the tiny size means it holds only a page or two. Check the figures against the manufacturer's adapter rating 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 @mobileschematicshub. 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.