To connect your Sennheiser headphones to a PC, follow these steps:

1. activate pairing mode: switch on the headphones and press and hold the corresponding button (often the voice assistant button) for about five seconds until the LED indicator flashes red and blue and you hear the voice message "Pairing".

2. activate Bluetooth on the PC: Go to the settings of your PC, open "Devices" or "Bluetooth and devices" and make sure that Bluetooth is activated.

3. connect the headphones: Click on "Add device" and select "Bluetooth device". Select the headphones from the list of available devices. If a PIN is required, enter "0000".

4. check the connection: After the successful connection, the headphones should be connected to your PC and you can use them for audio output.