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The GM12-MFF is a 12-Pin Y-Harness that allows the installation of a GM Factory Cassette, CD, or CD Changer to the OEM head unit of a GM vehicle equipped with OnStar. The adapter also allows one to add an auxiliary input adapter such as the GM12-AUX or GM12-PC/PIOX. Plug & play design means no cutting of wires of splicing. OnStar remains connected and on standby until you need it!