I see this topic come up at least once a week and every single time someone is telling the person the USB dongle is unique to each unit and can't be replaced. This is completely incorrect. I know all these people are just repeating what they have been told/read, but it's wrong.
Once you find a replacement USB dongle, do the following to pair it with your set.
1 Connect the wireless adaptor to a PlayStation system or other powered USB port.
2 Insert a small pin or similar object into the hole surrounding the reset button in the wireless adaptor, and push in for at least one second.
3 On the headset, hold down the MUTE button and the VSS button.
4 While still holding down the MUTE button and the VSS button, slide the power switch to position 1 or 2.