Specification sheet for a green 10 mm LED, provided as a 517 KB PDF. The name gives no manufacturer or part number, so check the document for the exact series, luminous intensity, viewing angle and forward voltage. A technician uses such a sheet to choose a suitable series resistor, verify polarity from the lead length or flat edge, and find an equivalent replacement for indicator lamps in panels and appliances. Confirm current ratings before driving several LEDs from one supply.
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. 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.