Fully tested,Apple, two colour beige and smoke brown M0100 mouse used on the original Macintosh 128K, 512K and Plus. This is the revision 2 model manufactured in the US which had a smaller rounded DB9 connector with smooth finger screws, and two screws in the base. This A-grade mouse is in very good condition though do to it's age, it may still have some mild yellowing of the plastic.