Step 1: Plug the C81in.
To power on the C81, plug it into the device you would like to stream audio from. Upon being plugged in, the LED on the C81 will turn on.
Step 2: Set the C81 into Pairing Mode.
Long-press the MFB on the C81 until the LED is flashing BLUE and White alternatively to set the C81 into pairing mode.
Now set your bluetooth headphones/speaker into Pairing mode too, wait for a while, they should connect with each other.