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If you look at wired Xbox360 controller it has what looks like 2 filters on its wire near USB connector. I only recently noticed that that bigger filter is actually an alternate connector with strange pin configuration. What is it for?

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up vote 7 down vote accepted

I believe you're talking about the inline release seen here

alt text

You can read about it at this page on It's a safety mechanism that allows that part to release rather than having the controller pull your console off a table or something if someone were to trip on the cord, etc.

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