I can’t copy the exact Ebay link & Picture but I bought this
2in1 Bluetooth Transmitter Receiver USB Wireless Stereo Dongle Audio
Adapte U8M4. ( 223746319211 )
It works great and seems to be the same as the Senn. It cost $1.99. - free shipping from China
Edit: I see the price has gone up - it is now $2.07. (but they are accepting offers)