The Asus 0A001-00860200 is a 120W AC adapter for compatible Asus notebooks, with a 20V output and a 3-pin 4.5PHI connector. These specifications identify the particular adapter variant and help match it to the required power supply.
The listing associates it with Asus UX564EH, GA503RS and M3401QC notebooks. It is an external power source for notebook use, suitable as a replacement for the adapter with this part number or as an additional supply for the listed models.
The power cord is not included, so the package contains the adapter itself, without a cord.