Note: For some older headphone models, pairing is not always possible under Windows 10 due to lack of compatibility.
Instructions
Follow the steps in this post to pair headphones on devices running Windows 10 operating system.
Prerequisite: your computer is running Windows 10 and has a Bluetooth interface turned on, which is not actively connected to another device.
1) In the settings of your computer, open the menu "Bluetooth and other device settings".
2) Click the "Add Bluetooth or another device" button
3) In the "Add Device" pop-up menu, select the "Bluetooth" option and also enable Bluetooth on the computer here, if not already done. Now start a pairing process on the headphones.
4) The headphones will now appear in the computer's menu.
5) Click on the device name to establish a connection.
6) The device is now ready for use.
Selecting the headphones for playback
If you have already added several playback devices to the computer, select your desired playback device via the Windows speaker icon (bottom right).