why does my playstation 2 controller have a usb port?

I have a playstation 2 controller that's by Nyko, it has 2 ports, one that fits the regular ps2 slot, and one usb part. Anyone know why?

Thanks!

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Tagged as: Controller, Playstation, Port

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http://www.gameconsolebundles.net/3416/why-does-my-playstation-2-controller-have-a-usb-port.php

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