It looks like some one has taken the USB SD-CARD reader, and rip off the slot in the back, and melted on some black rubber.
The black glob on the back is the usb mcu interface to the missing sd-card slot.
I bet these are the very same USB SD-CARD readers they always throw in with the cheap R4 cards.
If I had one I would compare to it, so verify, I bet my life on it, that is what it is, if you do a search on CBM081216 YHL-DLK-4081
The first part 081216, means it was designed on 2008-Dec. 16th
Yep, edit that is what it is, the CBM and 4081 match this:
Chipset: Chipsbank CBM4081
By chipsbank in china!