What Xbox controller does this wireless receiver belong to?

[Satoshi_Matrix]

I picked up an Xbox 1.0 recently, and among other things, it came with a receiver to some 2.4 Ghz wireless Xbox controller but sadly not the controller itself. I'm curious if anyone can help me figure out what controller it actually belongs to. To my knowledge, there weren't too many companies making wireless controllers for the original Xbox - Logitech and MadKatz are the only two I can think of, and I don't think the receiver belongs to either of them. I have the Xbox Cordless Precision and a MadKatz mini pad and their receivers are very different.

Here's the pics:



and here's the bottom:

[gtmtnbiker]

Using the FCC ID, I traced it to Mad Catz:

https://apps.fcc.gov/tcb/GetTcb731Report.do?applicationId=718749&fcc_id='P25BWMC4556C1304C'