What's this cable supposed to be for?

I picked up an original 2G 16GB iPhone off eBay for my mum this week and it came with a cable that I've not ever seen before and not sure what it's supposed to do?

This is it:

http://images.ukspec.com/cable.jpg
What's it for?

Had a bit of a Google and can't find anything about it - saw something similar which said it was a charger lead for an iPod Shuffle 2G but not sure why it's come with an iPhone - unless it's just been included by mistake? It's made with the same connectors and outer materials as the iPhone USB charge cable?

Thanks in advance!

Mistake methinks -
http://www.dhgate.com/100pcs-3-5-mm-...9b4ec4d87.html

Isn't that an ipod shuffle (3rd and 4th gen) sync/charge cable?

Quote:

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Originally Posted by GTI

Isn't that an ipod shuffle (3rd and 4th gen) sync/charge cable?

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It is indeed, brother needed one of these as a replacement a few weeks ago.

Not too sure whether it'd be any good on an iPhone 2g, I doubt it'd do anything.

Cheers guys :D