I bought this item second-hand. Because it did not work at all with Jabra headphones I wanted to return it. This was refused because I no longer had the brown non-original box it came in.

Pairing is always tricky: lights flash, you press buttons, but it doesn't connect. After several attempts, it usually works. Rules:
- Switch on: 3 seconds ((middle button))
- Transmit: briefly ((Tx)), Receive: briefly ((Rx)), if no connection switch external device off and on again.
- Switch off: 4 seconds ((middle button)).

Patience and good luck!