unknown symbol on proclip device holder

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[edit]I think I figured it out. It's audio output only. TMC Antenna&audio combined have 4 connectors and this one (after opening it up) has only 3.[/edit]

I bought a mount for my car to put my tomtom 750 on it. The mount itself has a few plugs
- music player
- usb
- to me unknown symbol (radio?)
Here is a pic: https://dl.dropbox.com/u/558491/tomtom-audio-sign.jpg
(left-hand side = music, right-hand side = ?)

Anyone has an idea what exactly this plug is for? I have a few guesses:
- radio (fm transmitter) antenna?
- tmc antenna?
- routing audio to car radio?

or maybe some of them combined? it's a 3.5mm plug but i don't know how many tracks..

I'm really confused...

Thanks in advance for any help

 

[mikealder]

Yes that socket is for the stereo audio line output that you can connect to the aux input of the car stereo if its got a suitable socket available - Mike