You can load your watch with music and take it to go — but there’s one catch. You can’t listen to music through the Apple Watch’s tiny speaker (nor would you want to) and there’s no headphone jack to plug in headphones.
Instead, you need to pair Bluetooth headphones (or a speaker) to Apple Watch in order to hear music.
To clarify, this isn’t necessary if your iPhone is nearby, as you should hear music coming out of the iPhone’s speakers or headphones connected to the iPhone. Pairing a Bluetooth device to Apple Watch directly is only required if your iPhone isn’t around.
To connect a Bluetooth device to your Apple Watch, follow these steps:
Put your Bluetooth headphones or speaker in pairing mode.
You might see a flashing light on the device to confirm it’s awaiting a connection. It’s different for all products, but pairing usually involves pressing (or sliding) the main button and then holding it until you see a flashing light.
On Apple Watch, locate the Settings app — which looks like a gray gear — and tap it.
Alternatively, you can lift your wrist and say “Hey, Siri, Settings.”
Inside Settings, twist the Digital Crown button until you locate Bluetooth and then tap this option.
Wait a moment and your Bluetooth headphones or speakers should appear in this list.
Select the Bluetooth device you want to pair it with by tapping its name with your fingertip. Once a device appears, you can tap it.
You’ve successfully paired the device, but you still need to change the music source from iPhone to Apple Watch to hear music come from your Bluetooth-enabled headphones.