FM Modulator. Allows you to plug in an external source, and splices inline with the antenna input and back of the receiver. Turn to the preset channel on the radio, and it works pretty good. The transmission strength of the radio transmitters is now regulated, so they're basically worthless. Almost everyone who gets Sirius-XM in their cars now that's not OEM equipped will use an FM modulator when no aux input is available.
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Living in the United Socialist States of America.
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