Question about Aukey Bt-C1

Plug the transmitter into the headphone socket of the PC and press the on/off switch for several seconds until it flashes blue (LED is very difficult to see), then switch on the headphones as well, it then takes a few seconds and the headphones are connected. (I also use the Sony WH-100XM2 in combination with the PC and had no problems).

I almost despaired until I managed to press the button for the right number of seconds until the device got comfortable in pairing mode. At some point it worked, as described by daniel_b_88.

Bluetooth from other devices in the vicinity, such as mobile phones etc., must be switched off, otherwise pairing will not work!

There is a button on the Aukey that you have to press and hold to put the Aukey into paring mode. The button is a bit hidden, it is near the USB socket. When the Aukey is in pairing mode, an LED flashes red/blue (if I remember correctly). Greetings