Hi Tim
To pair Bluetooth headphones with your Apple Watch:
- Put your Bluetooth headphones into discovery / pairing mode (follow the instructions provided with the earphones).
- On your Apple Watch, go to the Home screen (single press on the Digital Crown), then tap on Settings (the cog icon) > Bluetooth.
- Your Apple Watch will now search for Bluetooth accessories that are in discovery / pairing mode.
- Choose your Bluetooth headphones when they are shown.
- If asked, enter a passkey or PIN.
You may find that you need to unpair your headphones from your iPhone and iPad (or any other device that they may already be paired with) before you can pair them with your watch. If they are already paired with your iPhone and iPad:
- On your iPhone and iPad go to: Settings > Bluetooth.
- Find the headphones in the list, then tap on Forget this Device.
More information:
Use Bluetooth accessories with your Apple Watch - Apple Support
Listen to music on your Apple Watch - Apple Support