This is the Super Game Boy from Nintendo for the Super NES, dated 1994. This allows you to play Game Boy and Game Boy Color cartridges on your SNES (not GBA of course, since this well predates the Game Boy Advance). This is the cartridge by itself. No box, manual, slip case, or anything else is included. The label on the back has tearing damage. See pictures for details.
Accepted payment methods are:
Cash (mailed in a secure manner)
Money Orders and Cashier's Checks