RAR archive of 1.82 MB for the original Xiaomi Mi 2 smartphone. The name gives only the model, so whether it contains schematics, a boardview or other service files is unclear until it is opened. Such documents let a technician follow power paths, locate parts and test points, and track down shorts behind no-power, no-charge or boot faults. Since the related Mi 2S may use a revised board, compare the markings printed on your PCB with the material before taking measurements from 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 @SMART_PHONE_SCHEMATICS. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.