This adapter is required when you retrofit RNS510 ant the same generation radio/navigations (RCD510, RCD310, RNS310) units in cars where earlier generation units were installed (such as MFD2, RCD300).
This adapter allows to connect radio antenna wiring with new navigation unit, because connectors are different.
Installing is truly easy since it does not require cutting any wires or altering plugs - it is plug & play.
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