I’m assuming you want the controller for the PS3, not your PC.
I’m not 100% on this but I remember reading ages ago about 3rd party controllers that come with those USB dongles are fakes. The genuine DS3 controller does not need a USB dongle of any kind to work.
My only other suggestion is that it is a BT adapter for a PC, but I’d put my money on it being a cheap wireless controller that can’t use Sony’s integrated wireless solution, so they give you a USB receiver instead.
It will probably still work fine, if it’s crap you haven’t really lost that much.